"You did remember to buy a lock for the window too, right?"
"The materials used to create a lock are of utmost importance. Shoddy brass or copper will give way to a well-placed kick, thereby rendering the lock itself useless. I recommend steel over iron when choosing a material. More robust materials tend to be prohibitively expensive and necessitate the door being made of similar metals. I have been chagrined to stumble across the shattered shell of a wooden chest, its dwarven lock intact and still locked."
This door is absolutely impenetrable. It's made of 100% Indestructium, is guarded by robot monkeys with crossbows, and opens only to authorized personnel who possess ten different keys, pass the DNA test and retina scan, and present a valid birth certificate. Yes, no one will ever force his way into — "Open!" Says Me. WHAMM!!!
Wait, did you just break the door off its hinges?
This is Crippling Overspecialization applied to architecture. A designer puts immense effort and resources into a structure, most often a defensive point such as a wall, door, or window, but fails to notice a large weakness in the design that makes all of this easy to circumvent. The most common flaw being that for all that the door itself is indestructible, the wall around it is less so. This is especially so in Chinese and Japanese media where many walls are made out of paper. Often, the floor will also be vulnerable to burrowing. The door itself may not be that hard to open, especially if We Have the Keys. Often played for laughs if the way through the apparently impenetrable defense is particularly obvious or easy. Sometimes serves as a Surprisingly Realistic Outcome for whoever thought that they or their stuff would be safe in such a place.
A common justification In-Universe, which is also the reason for most Real Life examples, is that the designer Didn't Think This Through. However, the reason is sometimes that the writer is unfamiliar with secure design, in which case characters who should have known better are not called out in-universe for making an amateur mistake. Occasionally however, the design is fairly solid in-of-itself, but only succumbs to this trope because it's vulnerable to something outside it context and/or intended use. Perhaps the design is perfectly sturdy, bullet/bomb-proof, and overall impenetrable as intended, but it cannot withstand, say, a laser blade (but really, unless you’re in the galaxy far, far away, who would have a laser blade?).
Compare Dungeon Bypass, Cutting the Knot, Override Command, Steal the Surroundings, Absurdly Ineffective Barricade, Inventional Wisdom. Contrast There Was a Door.
Examples:
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Advertising
- Played straight in a TV ad
for a French reinforced door company: France's equivalent of a SWAT team is raiding an apartment building and hits a particular door with a battering ram: This takes several tries, and only makes a huge hole in the wall around it, with the door and its frame still standing.
Cop: This is the second time this week...
Animation
- In the Pleasant Goat and Big Big Wolf: Joys of Seasons episode "Candy House Fantasy", Paddi builds a candy house and hides in it to get away from Wolffy, who is trying to capture him. The house would seem otherwise impossible to damage if not for how, with it being made of candy and all, Wolffy can eat through it easily.
Anime & Manga
- In an early episode of Ghost in the Shell: Stand Alone Complex, a cautious Togusa decides to open a door carefully in such a manner that he wouldn't set off any potential traps that may be rigged up. An impatient Batou says that it's an admirable skill to have, but they are in a hurry to bust a criminal. He kicks the door in, busting the bolt off the door in the process.
- In Heavy Object the Cook Addition Islands are artificial lands meant to house top secret Object development. However there were multiple contractors involved in the construction with varying ideas on what security was needed for individual jobs. Air vents are completely secured against trespassers but utility passages are unlocked and lead directly into otherwise secure areas.
- Happens twice in Hunter × Hunter:
- During the Hunter Exam, the group of main characters are given a Sadistic Choice in the form of a fork in the road: A path that takes many hours to walk through that all five can enter and a path that takes only 5 minutes that only one person can enter. The team only has several minutes left before time runs out and they are disqualified, so the solution they decide upon is to go through the long path meant for five people, then punch through the wall separating the two paths and climb through the hole to take the short path.
- When Gon and Killua get captured by the Phantom Troupe, Nobunaga wants to nominate Gon into the troupe and chooses to keep them captive in an abandoned apartment building room until the troupe's leader returns. To that end, Nobunaga chooses a room with only one door and guards it, always keeping watch. Gon and Killua escape by each punching a hole through walls on opposite sides of the room, shocking Nobunaga and paralyzing him with indecision so the boys could create some distance from him, and they continue to punch holes through walls around the building to confuse Nobunaga long enough to leave the building and entirely out of Nobunaga's reach.
- In Kekkaishi, kekkaishi are a type of magician who create psychic boxes that can destroy things inside. When someone traps a kekkaishi in a hole, and seals the hole with a rock that can't be contained in those boxes, the kekkaishi simply tunnels her way out.
- In the first episode of Lord El-Melloi II Case Files, Waver and Melvin are locked up in a prison with magic-proofed door. After briefly catching up with Melvin, Waver proceeds to simply pull the hinges out of the walls and gently push the door out of its frame.
- Magu-chan: God of Destruction: The Holy Knights designed their fortress shotgun-style because they wanted intruders to duel their five leaders in separate rooms each in a row. This just let Mag blow a hole through all five rooms at once.
- Pokémon: The Original Series: In the episode "Turning Over a New Bayleef", the Team Rocket trio traps a group of Pokémon under a dome made of "absolutely, positively unbreakable" glass. However, the dome isn't quite securely attached enough to keep it from being pried loose (as James later says, "it wasn't absolutely, positively unshakeable"), and so Ash and the captives are able to dislodge it.
- In the finale arc in the manga Ranma ½, Akane is held in a cell by the bird tribe. She desperately tries to kick and ram the bars through to no avail. In her frustration, she leans to one side... and tears open the flimsy lock on the cell.
- In one chapter of Sgt. Frog, the Keronians test out their new security system on Momoka's mother Ouka, who wants to get her hands on Keroro for some reason. The first obstacle is a series of electronic locks on the mini-fridge that serves as the main entrance to the lair. What does Ouka do? Rip the door off its hinges.
- In the second Squad Jam of Sword Art Online Alternative: Gun Gale Online, Team SHINC has to bring in an anti-tank rifle to even attempt to penetrate M's space battleship-armor shield, which is impervious to nearly any sort of gun in the game. It turns out that, while those bullets still fail to penetrate the shield, they hit hard enough to break the hinges and support bars holding the shield together, since they're made of far less exotic materials.
Comic Books
- Disney Ducks Comic Universe: Scrooge McDuck has sometimes found himself in trouble because his impenetrable Money Bin with unbreakable walls and gates lacked a proper floor and/or foundations due to the owner's stinginess.
- A running gag in the Lucky Luke album "The Daily Star" resolves around a sheriff who takes great pride in the fact that the bars of the cell in his office are unbreakable, which he claims will prevent any escape attempts. Although he is right about the strength of the bars, the rest of the office is not that strong so it's still very much a Card Board Prison. At the end of the story, the entire sheriff's office is destroyed with only the bars still standing.
- Doctor Strange:
- Strange's own Sanctum Sanctorum is guarded by warding spells linked to its characteristic round window. A band of his enemies once gained access by breaking down the wood of the window frame, causing the whole thing to fall apart.
- In Doctor Strange: The Oath, a door is sealed with a magic sigil. Strange asks Wong to break the door down. Seconds later, the Night Nurse calmly picks the lock with a hairpin.
- Wonder Woman volume 1 #231 ends with her being imprisoned behind walls of extra dimensional glass Osira's brainwashed soldiers are confident Wonder Woman can't break through. Wonder Woman #232 sees her break through the stone floor beneath the glowing glass.
- X-Men: The otherwise unstoppable Juggernaut is vulnerable to telepathic attacks, so he wears a helmet that blocks mental probing. While the helmet is virtually indestructible, it's still been forcibly removed by his opponents many, many times. To his credit, Juggernaut does have means of adapting to this weakness, such as a skullcap made of the same material that serves as an extra layer of protection and is harder to remove.
Comic Strips
- In a Gnasher and Gnipper strip, after the dogs knock over Dad one time too many, he buys a pair of special gnash-proof chains to keep them restrained. Fortunately for the dogs, while the chains were completely gnash-proof, the wall wasn't.
- Hägar the Horrible:
- There is a strip where Hagar returns from a plundering, handing Helga a large, well-crafted castle-style lock, noting that she's been worried about people breaking into their house. She's initially overjoyed until she asks where he got it. "Oh, it wasn't too hard — it only took me five seconds to rip it out."
- In another strip, the occupants of a castle brag about how strong their door is. Hagar hits it with a battering ram and the door is unharmed. The rest of the castle falls down around it.
Fan Works
- In the Touhou Project fanfiction FREAKIN GENSOKYO, barriers and locked doors sometimes block the way deeper into a building. The walls around the door, however, are usually not as strong. Brad takes advantage of this by breaking through them with an enchanted plant hanger.
- in the My Hero Academia fanfic Hero Class Civil Warfare Mei refers to it as the Invincible Door Fallacy: Shouji gets around a heavily reinforced door by breaking through the wall next to it. Later in the same chapter, when Mei is trying to obtain one of the Villain Goals held inside of a glass display case and unlocked through a logic puzzle, Shoji pulls the same trick.
- In If Wishes Were Ponies..., while searching Hogwarts for secret passages, Elly finds a secret passage directly to the Mirror of Erised room, completely bypassing all of Dumbledore's traps, that Dumbledore never found because it's one-way.
- In Little Whinging Pet Shop, a collection of one-shots, a Kryptonian Harry Potter punches a locked door and finds it is indestructible (and punching it hurt his fist). However, the impact cracked the archway around the door and the door fell down a moment later, much to Harry's annoyance.
- Attempted by Ash Ketchum in Pokémon Reset Bloodlines when he's kidnapped by Sabrina. While trapped in the Saffron Gym, Ash's Pokémon first try to break through the doors and windows to escape, but they fail due to them being reinforced with Reflect and Light Screen. They instead decide to try and break down a wall, but Sabrina herself appears before they can do so, although she commends him since nobody had thought of trying that before.
- In the Project Dark Jade fic Shadows Awakening, the gates to the Forge of Shadows are indestructible, but the walls aren't, allowing the heroes to blast their way in. Kyosuke/The Phantom admits this was an oversight, but defends himself by saying that it was built before his time.
- Invoked in Spider-Man: Finding Home when Shuri is questioning Peter, Yelena and Kate while all three are restrained on a table. When Peter actively tries to get out of his bonds, while the restraints are made of vibranium, the table itself is less durable, allowing him to tear off chunks of the table even as the restraints remain around his wrists and ankles.
- In Storybook Hero, after Harry Potter and some of his friends are arrested, he and a half-giant break out of a cell with an indestructible door by punching it until the hinges broke.
- In the other Project Dark Jade fic Webwork, Uncle has made the Vault door impervious to attack by evil magic. However, he wasn't able to do this for the surrounding walls, so Jade has her Shadowkhan chip away at those to weaken the door enough for her to pull it loose. Uncle calls this cheating.
Films — Animated
- Kung Fu Panda 4: The Chameleon manages to trap Po in a magically enchanted cage that's too heavy for him to lift on his own and too tough for him to break out... but there's no bottom to the cage, so Po manages to escape by breaking through the stone floor of the Chameleon's palace.
Chameleon: That's frustrating for a number of reasons...
Films — Live-Action
- As seen in Avengers: Infinity War, the force field protecting Wakanda only keeps out roughly 99% of whatever is trying to get through it, and while that's a high enough success rate to keep out humans like Klaue (most of whom didn't even know Wakanda was worth invading until recently), it isn't particularly effective against an army with a We Have Reserves mentality. In fact, it turns into something of a disadvantage, because the swarm is large enough to surround Wakanda, allowing some to break through behind the gathered Avengers' defense, closer to the facility they're trying to protect. They wind up having to open a section of the force field to ensure their enemies enter at the proper spot to be defeated.
- Hot Shots!: Lt. Cmr. James Block comes to the Native American tipi that Topper Harley is living in and rings the electric doorbell located next to the door flap, which is made of an animal hide. Harley is heard unlatching an excessive number of locks before opening the flap, and the inside view shows several latches and door chains mounted on the pole next to the door. This serves entirely as a joke, since logically it would be useless to lock a structure where somebody could simply crawl under the wall or cut it open with a knife.
- The Jewel of the Nile: When Joan is locked in a prison cell with Al-Julhara, she starts using a stick to chip the mortar from around the window frame, something she had once written about in her novels. Upon realising that they should escape together, Al-Julhara simply takes hold of the filigree window and pulls it out of the wall, explaining that it was riddled with dry rot. He had known how to escape the cell for a long time, but had nowhere to go before Joan arrived. This is made more obvious by the fact that she had already fallen through a weakened roof in the same cell the night before.
Al-Julhara: It's not the bars that make the prison. It is the desert.
- Jurassic Park (1993): The lab door is shown to be lockable and extremely durable, meaning that when it's sealed, it should be secure, except that right next to the door is a wall-length non-reinforced window. The velociraptors end up making use of this to break in.
- In The Coen Brothers' version of The Ladykillers, this comes into play with the design of the underground casino vault the characters are stealing from. The door and walls bordering other rooms in the building are highly secure and reinforced; however, the wall facing outwards (to underground soil) is just a normal wall. The characters exploit this weakness by tunneling underground from a nearby cellar to the casino vault, and right through the wall. After emptying the vault, they close up the hole in the wall to make it look like it was never penetrated, and they use explosives to destroy the tunnel behind them.
- The Lord of the Rings: The Two Towers:
- Helms Deep. While the book isn't as specific about the details of the fortifications and can be given the benefit of the doubt in some respects, the scale and form of the fortifications are more clear in the movie and therefore more open to criticism. On the plus side, they depict the culvert in the Deeping Wall with a great big iron grille, but this is more than negated by the fact that the culvert in the movie is so enormous that orcs can enter two at a time, carrying bombs between them, without even having to duck their heads! Such a huge opening seems like total overkill to let out a stream that is only shown as being up to the orcs' ankles, and even if the designers of the fortress hadn't known of gunpowder, they should have at least expected that sappers would have tried to enter the culvert with picks and chip away enough rock to dislodge the single iron grille. Also just like in the book, the garrison doesn't think to block up the culvert with rubble before the enemy arrives. They don't give enough attention to defending it until it's too late and the Uruk-hai blast their way in.
- The Hornburg itself has only one relatively flimsy gate that the Uruk-hai have to smash through before they're inside and able to wreak havoc. If it had a proper gatehouse like most real castles did, they would have had to break through a portcullis as well, and then found themselves faced with another gate and portcullis while being funneled into a small passage where the defenders could shoot them (or even impale them with spears) from holes in both sides and the ceiling. The arrangement of concentric walls does incorporate a very good idea from Real Life castles though, which is having the gate in the outer wall lead into a tight 90-degree turn that would be difficult to fit a ram through, channeling the attackers down a long path where the defenders could shoot them from the battlements on either side, and then having the gate of the second wall be 90 degrees at the end of that. However, the insides of the outer walls are not crenellated to take full advantage of this, and most gallingly, there is no gate restricting passage through the inner walls; instead, there's a huge archway that anyone could ride right through, which almost defeats the point of having an inner layer of walls in the first place!
- In Office Uprising, Franklin Gantt made a crucial mistake when designing his panic room; the doors are made from two-inch thick metal, but the walls are not only standard but were actually built by a cheap contractor, making it easy for the Zolt-infected and deranged workers to break in that way.
- Pirates of the Caribbean:
- The Curse of the Black Pearl presents a lesson: Don't build a jail door using half-pin barrel hinges. Although it's implied that Will only knows how to break the door because he helped build it.
- At World's End has a return of the half-barrel hinge on a jail door, enabling Jack to extricate himself again after one of his hallucinated doppelgangers notices it, and he remembers "leverage".
- In RED, Frank Moses circumvents a password-protected lock that he describes as "unbreakable" by kicking a hole in the flimsy drywall next to it and opening the door from the inside.
- In Sneakers, Bishop is confronted with an electronic door lock that was installed soon before his break-in. He radios for help; the team is not happy; and after a few moments of silence where he (but not the audience) hears the plan, he simply kicks the door open.
- Star Wars:
- The Death Star is a planet-destroying space station which can be destroyed by firing missiles down a small exhaust port which directly leads to the main reactor; said port is at the end of a trench that cannot be easily defended by fighters or defense turrets. However, given the fact that the exhaust port was so small that only a Force-user could make the shot — and there were about two known Force-users in the galaxy not working for the Empire at this point — it's not as Myopic as often thought, and it ends up destroyed in A New Hope. Rogue One retcons the design. The lead designer of the Death Star, realizing that refusing to help would only delay the project, purposely built in a weak point which could be exploited without the Empire's knowledge. He wanted the Death Star destroyed more than anyone.
- Star Destroyers have an elevated bridge atop which are two shield generators. Leaving these generators exposed makes them an obvious target for fighter craft, who can knock them out and take out a large chunk of the ship's shields (especially the ones around said bridge). The bridge being completely exposed also means that the ship's control system can be taken out relatively easy, at which point there is apparently no backup command post. This is exactly what happens in Return of the Jedi.
- The Trade Federation's Lucrehulk control ship in The Phantom Menace. There is a corridor large enough inside it for a snub fighter to fly through leading from the hangar straight to the ship's main reactor. This allows Anakin Skywalker to destroy the ship by complete accident.
- In Toys (1992), The Tommy Tanks try to break into the warehouse where Leslie and company are hiding. After a few bashes on the door, they decide to blow up the wall next to it.
Jokes
- A kangaroo is brought to a zoo for a new exhibit. The next day, the kangaroo is found hopping around outside his exhibit. The zookeepers return the kangaroo to his cage and raise the fence. The kangaroo escapes again, the zookeepers recapture the kangaroo, and they raise the fence again. This continues until the fence is a ridiculous height, yet the kangaroo keeps escaping. Finally, a patron figures out the problem: none of the zookeepers had remembered to lock the gate.
- As Jeff Foxworthy noted about a portable safe his wife bought for him as a gift: "To save thieves the hassle of gathering up your belongings, it's the portable safe! With an easy tote handle so they can take it back to the thieves' den and figure out the combination at their leisure. The portable safe, by RonCo."
- From an old joke about cowboys and Indians: "On the third day in jail, Eagle Eye noticed one wall was missing."
Literature
- In Anansi Boys a police specialist bemoans Graham Coates' security arrangements, pointing out that he installed a wonderfully secure door, then hung a lock on it that the specialist picked effortlessly.
- In Artemis Fowl when Butler is rescuing Artemis (trapped in his "secure" office because the lock had been welded shut), he blasts the frame instead of firing at the door itself. He notes that the security flaw should be fixed even as he exploits it.
Butler put three rounds into the door frame. The door itself was steel and would have sent the Devastator slugs ricocheting straight back at him. But the frame was the original porous stone used to build the manor. It crumbled like chalk. A very basic security flaw, and one that would have to be remedied once this business was over.
- Carl's Doomsday Scenario: Remex's office has a magically-protected door. Unfortunately, the rest of the building has no such defenses. Or any defenses at all, really.
- Discussed and defied in the satirical poem "The Deacon's Masterpiece, or, The Wonderful One-Hoss Shay", in which the eponymous vehicle is made "so like in every part" that there is no weak point that could cause it to break down. After a century of use, the whole thing disintegrates at once. This poem is sometimes referenced in engineering classes as it's connected to a real-life design dilemma: actually design a specific weak point whose lifespan is measurable and which can be easily replaced (the electric fuse being an excellent example); try to guess at and reinforce the points of major wear (which you often get wrong); or try to build everything equally strong at the cost of having no idea how long the thing will last or what kind of repairs it might end up needing.
- The Demon Headmaster: In The Revenge of the Demon Headmaster, this occurs near the end of the book:
"That won't get you out. The door is solid metal, one metre thick."
"But I bet the walls aren't." - Discworld:
- In Guards! Guards!, Vetinari is revealed to have done this on purpose: while the lock to the palace dungeon is on the outside, the locking mechanisms are on the inside. Would-be usurpers throw him in the dungeon expecting it to serve as a Tailor-Made Prison; instead, it's an impregnable fortress that he can "escape" at his leisure.
- In The Last Continent, Rincewind discovers that the cell doors in the XXXX jail have thick bars, sturdy locks... and weak half-pin hinges. (Five years before Jack Sparrow did it.)
- At one point a point is made of the wonderfully made reinforced hinges on the door of the notorious bar The Mended Drum. The point made is that they held up beautifully as the whole frame was ripped from the wall.
- In Interesting Times, Cohen and the Silver Horde are more or less free to roam about the castle, due to being the only ones who think to walk through the paper walls.
Six Beneficent Winds: But you can't go through walls!
Cohen: Why not?
Six Beneficent Winds: They're — well, they're walls. What would happen if everyone walked through walls? What do you think doors are for?
Cohen: I think they're for other people. - Used in Jingo by Nobby, as a joke on a common nostalgic phrase: "We never had locks on our doors in those days... that's 'cause the bastards even used to steal the locks."
- In Wyrd Sisters, Nanny Ogg is a guest in Duke Felmet's torture chamber, on the wrong side of a seemingly impregnable oak door with five-inch planks and a very big lock. Junior witch Magrat Garlick is faced with the problem of opening it. Magrat focuses. And gets in tune with the wood of the planks, reminding the old seasoned oak of happier days growing in the forest. There is a sudden eruption of oak tree in full green bloom, and suddenly there is no door. This gets Magrat a rare word of praise from Granny Weatherwax, who has also been contemplating the same problem. Although Granny mildly remarks she'd have worked on the stones of the wall, and reminded them of the old days when they were all hot and runny underground.
- In Explorer Of Edregon, Lord Faulk made his home office's door out of nearly indestructible petrified elderwood, but the rest of the house was made of pressed grass bricks. Vin decides to take the door for himself after Samtha rips it out of the wall, vowing that if he ever decides to use it as a door, he'll install it in a stronger house.
- A Hero's War: Morey's party finds a Nigh-Invulnerable crysteel door within a ruin from the lost civilisation of the First — but the stone walls around the door are crumbling.
Morey: What we want to do is to get into the room. Not open the door. We don't have to go through the door to get into the room.
- In one of Christopher Anvil's Interstellar Patrol stories, the villain boasts of how impregnable his Elaborate Underground Base is. When the protagonist puts this to the test, he finds that neither the villain nor his contractors realised that it's no good having foot-thick walls if they only go up to ceiling height, with a convenient access void above them.
- The Lord of the Rings: The Valley of Helm's Deep is protected by the mighty tower called the Hornburg perched on a great heel of rock, and the Deeping Wall running from the Hornburg to the southern cliff blocks the way into the gorge. The Deeping Wall is twenty feet high, so smooth on the outside that it offers no foothold, and so thick that four men can walk abreast at its top. Unfortunately, there are some problems:
- A wide culvert running right through the bottom of the wall allows the Deeping-stream to pass out. Having this weak point is a pretty enormous oversight, and since the builders of the fortress were clearly capable of great feats of engineering, there should have been more than one way for them to avoid this: one would be for them to divert the stream through underground pipes; another which might have actually enhanced the defensibility of the walls would have been to dig a proper moat for the stream to fill up and let the culvert be underwater with iron bars blocking it. However there is no moat, the culvert is accessible from the surface, and if there are any bars across the opening then the author doesn't mention them, making it sound like it's wide enough for an orc to fit through. While most of the attacking orcs with scaling ladders and grappling hooks are keeping the defenders focused on the top of the wall, some of them creep like rats through the culvert and get inside, requiring the Westfold-men to block up the inside of the culvert with stones under Gimli's direction as soon as they can. Why they didn't take the opportunity to block it up with rubble before the battle when they had the chance is left as an exercise for the reader. The rubble keeps the orcs out for a little while, but then the orcs blast through the blockage using the "fire of Orthranc" (presumably some kind of bomb), which also makes the hole much larger. The attacking hordes stream in and take the wall, forcing its defenders to either fall back to the Hornburg if they can, or retreat into the Deep if they can't.
- As for the Hornburg, it is accessed by a high causeway that helpfully forces the enemy to come a few at a time under the defenders' fire. However, the fact that the builders didn't go the extra mile and put in a drawbridge makes this defense much less effective and contributes to the orcs being able to bust their way in with rams and explosives.
- Moreau Series: In Forests of the Night, the previous tenant of Nohar's apartment was a paranoid who replaced the front door with a heavy bulletproof door. Nohar speculates on how useful this would be considering the wall around it is normal wood and plaster. He later uses this door, unhinged, as a shield during a firefight.
- This trope turns up in the Phryne Fisher book Death Before Wicket in relation to a safe that was cracked. It's a very big, impressive, well-built safe... except that the back isn't because the safe was made to be set in a wall. The present owners purchased it from a deceased estate and didn't know about the intended setting, so they simply left it on a desk, where the thief easily found it and removed the back.
- Redwall:
- The main gate of Redwall Abbey is large and thick, impervious to even the most dedicated of sieges. Basically, not one invading vermin horde has ever gotten through it. The tiny wicker side-gate, on the other hand, has been breached by countless invading hordes over the seasons (or the youngest of the Abbey's children are forever escaping through it into the woods and into the villain's clutches), probably accounting for every successful invasion of the abbey. This is presumably intentional since it would be easy to station three well-armed, armoured guards there during a siege to hack up any single file intruders who tried to get in. Unfortunately, being peaceful monks and villagers (nearly every book is set so far apart in time almost no one remembers times of war), the Redwall inhabitants never think of that.
- In The Bellmaker, the heroes are able to escape their prison cell by hacking the hinges (which are on the inside) off. Which is justified, as the heroes' "prison" was a peaceful residence, and was invaded only weeks back. The occupiers locked the heroes into the tallest tower, i.e. the place with the least chance of escape, but it is heavily suggested—because of it being the tallest tower—that it was probably the keep, and hence built to keep people out rather than in. Therefore, the hinges naturally were on the inside.
Live-Action TV
- Burn Notice:
- A common conceit in Michael Weston's voice-overs is that people are more apt to reinforce doors than the nearby walls.
- "Pilot": Michael uses this against Sugar, his downstairs neighbor who is also an obnoxious drug dealer. Michael notes that even a low-end drug dealer will probably have a reinforced door for extra security. So when Sugar is standing directly behind said reinforced door with a gun so he can shoot Michael if he makes it through, Michael first shoots through the completely un-reinforced wall to cripple Sugar, and then opts to go through the perfectly ordinary back wall to get behind Sugar, who's screaming in pain and pointing his gun at the door instead.
- "Loose Ends": Michael notes that warehouse doors are often reinforced, but walls aren't, and areas under windows are even weaker because they aren't load-bearing. Thus, he drives Nate's truck straight through the wall of a warehouse where Fiona is sheltering from a drug gang to pick her up.
- Exploited in "Breaking and Entering". Michael is casing the office of some Private Military Contractors to steal information later, posing as a prospective client, and critiques the security outside the server room, noting that despite the fancy biometric lock on the door, the door itself is hollow-core veneer: "You can cut through that with a hand saw." This is calculated to get the owner to tell him more about the system: he quickly explains that the door is alarmed and building security can be there in minutes.
- Another episode has Michael just remove a window AC unit by just kicking it back into the room to enter an otherwise locked house by entering from the window.
- A common conceit in Michael Weston's voice-overs is that people are more apt to reinforce doors than the nearby walls.
- Doctor Who: In The Space Museum", companion Vicki is helping the natives break into a weapons storage facility so they can overthrow the aliens who took over their planet. The computer guarding the door can tell if people are lying to it, which thieves logically would, so it doesn't check to make sure that truthful answers are approved answers, allowing her to get in with the following exchange:
Computer: Do you have the Governor's permission to approach?
Vicki: No.
Computer: State your name, rank, and number.
Vicki: Vicki, time traveller, no number.
Computer: Do you have proper authorisation for the removal of arms?
Vicki: Yes.
Computer: From whom do you have this authority?
Vicki: From Tor, Sita, Gyar, and Bo. Oh, and Dako. Let's not forget Dako.note
Computer: What is their rank?
Vicki: Xeron workers.
Computer: For what purpose are the arms required?
Vicki: Revolution!
[door opens] - In an episode of MacGyver, he's at a college supervising a day in which students who have locked the doors of their dorm rooms in various creative ways change places and try to open them. One student's room isn't locked at all. This plot was based on an actual annual event at Caltech.
- In one episode of The Mentalist, the Victim of the Week was killed via exposure to a deadly virus kept in a high-security vault accessed by retina scan — which didn't work right and would let in anybody who presented their eye for scanning.
- Midsomer Murders: In an episode, Scott opens a safe by removing its back panel with an axe: Only the front and sides were armored.
- In The Monkey King televised miniseries Nicholas Orton (Thomas Gibson) a Fish out of Temporal Water teaches Confucius a lesson of his he learned, never make an indestructible door without an indestructible wall around it.
- The Queen's Gambit: Nine-year-old Elizabeth is sent to an orphanage where they give green-colored tranquilizer pills to the children every day to regulate their behavior. Mr. Ferguson prepares the pills in the room where they’re stored, and gives each girl her pills through a service window which is shut and padlocked at night when the pill room is closed. Then the orphanage stops giving girls the tranquilizers because of a new law, but by this time Elizabeth is already addicted. She sees that the green pills are still inside the room in a huge jar, so one night while everyone’s watching a movie she takes a screwdriver from the basement and uses it to open the service window. The padlock is on the outside of the window frame, and the only thing connecting the padlock to the window itself is a metal plate secured by two screws. Elizabeth simply takes the screws out to disconnect the plate, allowing her to open the window and crawl inside without even unlocking or breaking the padlock.
- MythBusters: In the myth "Salsa Escape", Adam and Jamie were testing the use of salsa to dissolve the iron bars of a prison cell. Adam's attempt to use electrolysis to accelerate the process failed because he used alternating current rather than direct current (indeed, Adam joked that it seemed to be making the bars thicker... presumably due to the cooked salsa caked onto the bars). Jamie's attempt with direct current worked far better. After several failed attempts by Adam to break his bars using alternate methods, Adam had "one last attempt" which succeeded — using the nearby sink to punch a hole through the (unreinforced) cinder block wall.
Adam: And I escaped! In your face, iron bar!
- A minor example in Terminator: The Sarah Connor Chronicles, someone shuts a metal security door in their faces, and Sarah asks Cameron if she can get through it. Being a Terminator she could given time, but it's faster to punch a hole in the concrete wall. Of course, the person they were going after was expecting human pursuers, against whom the wall would have been sufficient.
Podcasts
- The Magnus Archives: Jurgen Leitner dedicated his life to collecting the world's most dangerous magical books and building a library capable of containing them. Unfortunately he spent so much time designing the place to make sure nothing could get out, he never considered the possibility that someone could break in.
Roleplay
- At one point in Ruby Quest, Ruby and Tom come across a door locked with a keycard reader. However, the door is made of wood, so the players just have Tom smash it to pieces with his crowbar.
Tabletop Games
- Happens more often than you think in Tabletop Role Playing Games; savvy players always check hinges, floors, and walls when attempting a Dungeon Bypass, and inexperienced GMs don't always plan for this (though some crafty GMs may actually invoke this to lead the players into a trap, especially when dealing with a group of savvy players). The oldest standby is the fighter as the back-up lockpicker. If the thief can't make his lock-picking check, the fighter can always bash down the door. Of course, a well-designed dungeon will make sure the noise alerts monsters and sets up ambushes. Bonus points when the doors themselves are made out of Fantasy Metals that make them Resistant to Magic or Nigh-Invulnerable, and the players realize that they can haul the doors back to town and sell them for more than they could have ever made actually clearing the dungeon.
Theatre
- In A Very Potter Musical, Ron assures everyone that Voldemort can't get in, because he's barricaded the door. Seconds later, Voldemort enters through a curtain right next to the door.
Video Games
- Blue Archive: Lampshaded in one afterword of Schale's Valentine Patrol event. As Chihiro lectures Valkyrie forces on electronic security, it cuts to Wakamo in her cell finding the electronic lock is a new super-secure model... but door hinges are old and worn out. Cue her blowing the door away and escaping again.
- At one point in Borderlands 3, you are tasked with building a bomb to attempt to get through a massive impenetrable door. After setting the bomb off, the door is perfectly fine, but the walls around it crumble to dust. Surprisingly for this series, this goes completely unremarked upon.
- Call of Duty: Modern Warfare 3's penultimate mission has your team encountering a room in an underground mine protected by a reinforced titanium door that you have no way of opening. So how do you get in? By planting shaped charges... on the much weaker concrete roof of the room.
- In Control (2019), near the entrance to the Maintenance Sector there's a door locked behind Level 2 Clearance. When entering Maintenance, you only have Level 1 - however, you also have Launch, so you can easily get inside by throwing some heavy object at the floor-to-ceiling windows surrounding the impenetrable door.
- One means of defeating the final boss in Deus Ex: Human Revolution uses this trope. The boss's most crucial component is shielded by bulletproof, shatterproof, explosive-proof glass. However, it's still glass, which means it lets light through. Lasers are made of light. One of your available weapons is a laser rifle. One well-aimed shot is all it takes.
- Exploited in Dragon Age: Inquisition by the main cast during the quest, "Here Lies the Abyss": The Big Bad's army of enthralled Grey Wardens has holed up in an ancient fortress that seems all but impregnable—until it is pointed out that said fortress was built before the invention of siege weaponry, and as such was not built to withstand trebuchet shots and battering rams. Sure enough, during The War Sequence that follows, the aforementioned trebuchets and battering rams inflict all hell upon the defenders, allowing the Player Character and their party to make entry.
- A common mistake for newbies to Dwarf Fortress, rarely realized until the fort's defenses are put to the test. Even veterans of the game can fall prey to this, since, due to just how complex the game world is, all it takes is a single, seemingly minuscule missed detail, such as a piece of debris jamming your main gate open during a goblin siege or an unlabeled lever which may or may not dump a lake of lava right in front of your entrance, to cause the whole fort to fall apart.
- In The Elder Scrolls series, Proper Lock Design is an in-game book which has appeared several times in the series. It points out that higher-quality locks aren't any good if the chest or door itself is easily broken. Putting this to the test yourself, however, isn't an option; while there are chests and doors placed pre-broken as part of the landscape, you can't ever break one no matter how hard you hit it.
- In the opening of Freedom Planet, Big Bad Lord Brevon enters the royal palace by burrowing beneath it, to the shock of the royals who thought that the walls of their castle were impenetrable. As Brevon himself notes, the walls are impenetrable; the floor, however, is not.
- Ghostbusters: The Video Game:
- It has "a psychonically charged gate attached to a damaged frame" as the second-to-last obstacle in the graveyard level. Of course, the stone cherubs are the only way to get it open...
- Played for Laughs earlier in the "Return to Sedgewick Hotel" level's cutscene. There's a lot of police-tape over the main door, as well as a sign from Walter Peck's agency, PCOC, that forbids anyone from entering — "ESPECIALLY THE GHOSTBUSTERS!" Ray suggests blasting through the doors, but Egon calmly opens the unlocked door.
- Ghost Recon: Future Soldier has a variant in its penultimate level, where at the very end of the level the military leader of The Coup holes up with several of his best security guards in his office. There's no reason your team couldn't just blow open the big double-door with a single C4 charge, except the guards all have their guns trained on that door - so your team blows holes in the walls.
- Jagged Alliance 2 has several locations with doors that are extremely difficult to pick the locks of and resilient enough to withstand a blast from even an anti-tank rocket. The walls these doors are placed in, however, are completely ordinary and can be blasted to rubble with an ordinary dynamite stick.
- Knights of the Old Republic:
- Often exploited by the Player Character. If you don't have a high enough skill to hack through the door lock, there's usually the option of just destroying the door or a section of the wall next to it.
- Jolee points out a particularly terrible case of it on Kashyyyk, the Wookie homeworld. Czerka Corporation wants to keep everyone away from its MacGuffin site (the Star Map), and does so by plonking a giant force field down across the only available path on the surface. Unfortunately for them, Wookies are arboreal and can simply climb around it.
- There's a sequence in Knights of the Old Republic II: The Sith Lords that mirrors the opening to A New Hope, with your group boarding the Ravager as several Sith troopers gather around one of the doors, preparing to open fire when it's blown open... only to be caught off-guard when your NPC allies go off-script and blow through the wall beside them instead.
- Braum's shield in League of Legends used to be a door to a magic vault. The door was unbreakable. The mountain the vault was part of wasn't.
- In The Legend of Zelda: Majora's Mask, the gate to the castle of Ikana is sealed and cannot be opened by any means... too bad there's a big hole in the wall right next to it. Amusingly, the presence of the hole seems to indicate that this trope occurred to Ikana's enemies in Termina's history.
- In Leisure Suit Larry 7: Love for Sail!, the door to the staff room is heavy steel and, if you get too close, about a hundred weapons emerge from the walls to point directly at your head. Security measures include testers for DNA, fingerprints, retinal scans, tongue prints, and urine analysis. But, it turns out, the latch doesn't work properly and you can get in by just pushing on it. To be fair, the option isn't among the list of available commands on the door. You have to type it in.
- Commonly seen in Minecraft. Someone will go through a ridiculous procedure to create an incredibly elaborate safe that takes a full 5 minutes to open and someone else will simply dig through the wall. Also, many adventure maps start with the player locked in a cell, with one wall made out of a block that the rules of the map say they're allowed to break (usually clay), allowing them to easily escape into the hallway or an unlocked neighboring cell.
- This trope is at play all over the place Phantom Doctrine, to ensure that the palyer can access every room of every level no matter what: such as having a door to a high security area be protected by a laser that raise the alarm when tripped, but the door itself isn't locked so it is possible to dash into the room, grab what's inside and flee before reinforcements arrive, a door being locked and/or watched by a camera but another door is entirely unguarded, or a door being watched by a guard, but because the room is on the ground floor and the windows unbarred, one can simply break the glass and hop in without raising the alarm, and so on.
- This is the logic behind at least part of a few levels in PAYDAY: The Heist and its sequel. "Panic Room" concerns an otherwise-unused apartment building that has been turned into a haven for criminal activity, complete with a big panic room to stash all their valuables in that the crew wouldn't normally be able to break into. The plan, as such, is to cut through the supports holding the panic room in place, blow out a big hole to the roof, and fly the whole panic room out via helicopter. "Counterfeit" likewise has the people you're stealing from keeping the plates used to print their counterfeit money in a secure safe that you normally wouldn't be able to drill or blast through from the outside - but that only applies to the door. The sides can be drilled through just fine, after which the gang fills the safe with water, stuffs C4 inside, and blows that, using the water pressure to blow out the door.
- The Geomod engine from the first Red Faction game let the player destroy just about anything in the environment. Bulletproof windows are completely indestructible — the walls around them are not. With enough explosives, a player can leave a glass pane floating in the middle of a twelve-foot-wide void.
- In Riven, you will find a wooden gate locked with a padlock, and searching for a key in the massive Age will prove futile. The solution? Crawl under the door.
- In the 2024 remake, the solution is even more in line with the trope: you can't fit under the door, but the gate's lone hinge is easily removed, causing the whole thing to fall aside.
- The Big Bad of Second Sight eventually hides himself in a room behind a large pane of glass which, apparently, is immune to not only bullets but all of your various psychic powers. Too bad for him the frame is ordinary metal.
- Monkey Island:
- The Secret of Monkey Island: If you let Guybrush be recaptured by the cannibals, they'll progressively beef up the security of their prison hut, eventually installing an all-steel door with a motion detector, never thinking that there might be a large hole in the hut floor.
- Monkey Island 2: LeChuck's Revenge: After a maze Guybrush is confronted with a massive door with hundreds of locks, Schizo Tech styled security, and chains all over. He opens it by using the open command on it. And what opens is just a small rectangle within the whole structure, suggesting that all those metaphorical bells and whistles are only there for show.
- Similarly to the Pirates of the Caribbean example above is the cell door on the pirate island in Shadow Hearts: From the New World. Natan just lifts it up and walks out.
- In Watch_Dogs, Aiden Pearce chases a bad guy into his sanctum, where said bad guy seals himself in a panic room protected by bulletproof glass. Unfortunately, he fails to consider two factors: One, Pearce is an expert hacker, and two, the bulletproof glass does not block electronic signals. Said bad guy meets his demise when Pearce simply hacks the bad guy's pacemaker and literally stops his heart.
Visual Novels
- Hatoful Boyfriend: Holiday Star: Sakuya insists that a room's security is flawless and so he can display an item legendary thieves are seeking without fear. None of the other characters are convinced or surprised when, indeed, the room is broken into, and they react with exasperation finding that the security was impeccable... around the door. Despite there being a window, and most characters in the game, being uplifted birds, being capable of flight.
"What kind of rascal blows their way in through the wall!? If they're going to break in, why not act with some semblance of decency and come in through the door!?"
Webcomics
- In Art of Domination, it's revealed one building's owner didn't have anywhere near enough funds to make it an impregnable fortress... so instead they focused on a big, attention-grabbing, indestructible door in hopes that it would make hostiles overlook the walls. It worked.
- Elf Blood: To be fair, the architects for the temple defenses designed their extra-fortified mastercraft-warded doors around solid bedrock. Problem is, none of the architects knew about dynamite.
- In Freefall, the Mayor's house has a top-notch security system, with one crucial oversight:
Sam: [picking up chainsaw] Of course, after this, she's going to start fortifying the walls.
- In a page of Gaia, one of the wizards looks like he's gonna unlock the door but the next page he blows the wall down instead.
- One of the Tempts Fate fundraiser comics from Goblins has the protagonist come to a magical talking door that asks anyone who approaches an incredibly difficult riddle. If they answer incorrectly, it triggers an instant-death trap. The door never said it was locked. Tempts simply opens the door and walks through without giving an answer at all.
- Homestuck. HB: Pry the wall from the safe. (Unfortunately, "That notion is even more ridiculous than the last one.")
- The Order of the Stick: Miko Miyazaki is trapped by Xykon in a completely indestructible forcecage so she cannot warn her countrymen of Xykon's impending invading army. However, she eventually realizes that the forcecage consists of walls and a ceiling, but no floor. By smashing up the floor, Miko is able to escape. Unfortunately, this was Xykon's plan all along, to the point where he even researched a custom spell called "Xykon's Moderately Escapable Forcecage". Now he can use a Tracking Spell on Miko to find the MacGuffin she is sworn to protect.
- Sluggy Freelance uses this trope twice in the Sluggy of the Living Freelance storyline.
Web Videos
- Atop the Fourth Wall: The Silent Hill: Dying Inside review ends with him finding unbreakable chains on his bedroom door, in a reference to Silent Hill 4. However, since the wall they're attached to is plasterboard, he just rips them loose.
- Several locks defeated by the Lock Picking Lawyer don't even require him to touch the lock in question, because they can be defeated much more simply by removing whatever the lock is attached to.
- Video 801 shows his attempt to get his wife into lockpicking by locking up a container of Ben & Jerry's ice cream with that company's ice cream lock, which he decribes as incredibly easy to pick open by feel. The package itself can still be easily cut open regardless of the lock being there or not; he comes back the next day to find the bottom of the container cut off instead.
- Video 906 shows an OmniMed cabinet which has a litany of problems even beyond the simplicity of its lock: the cabinet itself is made out of ABS plastic that can easily be bent and forced open; the mounting holes on the back are simple keyholes, allowing one to simply lift it off the wall and take the entire cabinet with them; and worst of all, the hinges on the door are attached by simple Philips-head screws.
- Video 1024 demonstrates a RUSFOL AR-15 wall mount, which the rifle mounts to through its magazine well and is then locked with a cable lock threaded through both the mount and the trigger guard of the rifle. As he then points out, however, the trigger guard of the AR-15 is designed to fold open for use with mittens in cold weather, letting it be removed without ever touching the lock by simply pressing a detent with, in his case, the tip of a Lego astronaut's radio - and, as he also notes, threading it through anything that would make it more secure is impossible (the cable lock is too short to go around the top of the rifle, and the mount going into its magwell precludes threading it through the ejection port).
- Video 1571 shows off a Toriexon fingerprint-locked gun safe. He's particularly vicious in his criticism of this one because, as he demonstrates, the handle for pulling it open once unlocked can be pried off, revealing a hole in the front large enough for any handgun stored in the safe to be pulled out without ever touching the lock.
- Video 801
Western Animation
- In the American Dad! episode "Toy Whorey", Roger's cliffside estate has the garage doors leading over the cliff, so when he backs up out of the garage, he falls over.
Roger: [after his car hits the ground below and explodes] Maybe I'll take my bike. Such a nice day.
- One episode of Chowder has Mung putting Chowder in a cage, but the bars are so weak that he's able to easily break them apart. He tunnels his way out.
- In Dragons: Race to the Edge, when the dragon hunters capture Heather and Windshear in their "dragon-proof" chains, Hiccup reasons, "If we can't blast the chains, blast the winches!" It works. The bad news is that the hunters fix that weakness next season — when they catch Meatlug and Fishlegs, the winch is made of the same metal. Hiccup reminds them, "But that wood deck isn't!" One blast later, Meatlug's flying away with the chain and winch dangling from her leg. They eventually create "dragon-proof" boats, with wood facades.
- In an episode of The Fantastic Four, Diablo is running from Thing and retreats into a panic room. He assumes he's safe since the door is made of titanium, which Thing is not strong enough to break. When Thing reaches the room, he just breaks through the wall.
- Example of Myopic Clothing in the Looney Tunes short "Duck Dodgers in the 24½th Century". Dodgers wears a disintegration-proof vest. Sure enough, the vest itself survives the disintegration, but not the duck inside it.
- In the Phineas and Ferb episode "A Hard Day's Knight", when Perry is fighting Dr. Doofenshmirtz in a robot of Queen Elizabeth I, the latter is piloting a robot dragon and tries to make it breathe fire, only to find that the flamethrower and the pilot's seat are both located in the mouth but the flamethrower is behind the pilot. He then lampshades this.
- In one Inspector Clouseau short of The Pink Panther the titular Inspector is chasing a criminal, the latter of which attempts to shoot out his tires. The Inspector laughs and states that they're bulletproof, upon which the criminal simply shoots the rest of his car causing it to deflate.
- The Simpsons:
- One scene in the nuclear plant in "Last Exit to Springfield" involved Burns and Smithers going through several layers of increasing security to reach a control room, which was seen to also feature an ill-fitting, flapping screen door leading directly to the parking lot, through which Burns has to shoo away a stray dog.
- The episode "Realty Bites" has a seized-property police auction, where the cops are selling a large iron gate that was designed to resist bullets, explosives, and battering rams. When asked how they managed to get through it, Chief Wiggum says the owner left it unlocked.
- There's also the episode in Japan, where Homer is arrested. The cell door looks imposing. But after being released, Homer just walks through the paper wall next to it.
- Steven Universe:
- In the episode "Onion Friend", Steven tries to keep Onion from stealing a bag of chips by blocking the door to his room. So, Onion just jumps out of the screen window instead.
Steven: ONION! We just put that screen in!
- In the episode "Lion 4: Alternate Ending", Lion coughs up a huge pink Cool Key... which unlocks a door to a place in the desert Steven's mom, Rose Quartz, was using as a garbage dump. The other three walls were almost completely eroded, making the key pointless.
- In the episode "Onion Friend", Steven tries to keep Onion from stealing a bag of chips by blocking the door to his room. So, Onion just jumps out of the screen window instead.
- The New Adventures of Winnie the Pooh: During a western-themed fantasy sequence, Pooh is thrown into a jail cell and somehow every single character is too stupid to notice that the bars are wide enough to easily step through and the back wall is completely missing. When Pooh is broken out of jail by Tigger, they even leave through the missing wall, but not before Tigger unlocks the door first, somehow not realizing they could have done that before.
Real Life
- The Maginot Line is an example in the popular imagination which was actually a subversion; it was a wise investment of resources which did exactly what it was supposed to — namely, forcing the German forces to have to go around the border. Unfortunately, by the start of World War II the French Army had major issues that had nothing to do with the Maginot Line.
- The French conception of warfare was limited in scope, so exclusively focused on tactical supremacy that it had completely forsaken operational-level mobility. French performance at the operational level was therefore dependent on their commanders' own ideas about warfare — and, typically, French commanders barely understood it.
- Ferdinand Foch's operational plan was poor. He forsook the French Army's strengths in taking and holding well-prepared lines, and tried to use it for something it was never designed for — an operation of rapid movement, the advices of advocates such as Charles de Gaulle fell on deaf ears. There was a good strategic rationale for this, given the logic behind preserving Dutch and Belgian industry, but it was still a risky move for an Army not designed or suited to execute it to attempt it against an Army that very much was.note
- The World War II strategy of “island-hopping” was designed to exploit this trope. Early in the Pacific War, Japan captured a wide swath of islands and island groups across the region to establish an ocean-spanning defensive perimeter for its empire. The underlying assumption was that the United States would be forced into a slow, costly advance through a chain of fortified positions—where prepared defenses and (at least early on) strong local Japanese air and naval striking power could inflict heavy casualties—buying Japan time and setting conditions for the hoped-for “decisive battle” to cripple the U.S. fleet. The Americans understood this logic, so they developed island-hopping. Essentially, U.S. forces pushed forward by using carrier and land-based air power (along with naval power) to suppress enemy air strength and key defenses, then captured smaller, more lightly defended but still strategically useful islands instead of assaulting every heavily fortified stronghold. Once the smaller islands were secure, the U.S. built airfields and bases on them to gain air superiority and control the surrounding sea lanes, which allowed them to cut off bypassed Japanese garrisons from resupply and reinforcement. This reduced costs in time, materiel, and casualties, while leaving many heavily defended Japanese-held islands isolated—unable to receive adequate supplies—and left to “wither on the vine”, i.e. starve. By using this approach, the U.S. was able to advance across the Pacific more quickly and conserve resources for major, strategically crucial objectives such as the Marianas and the Philippines, while Japan was repeatedly caught off-guard by the unexpectedly-fast pace and direction of the American advance.
- One particular campaign that serves as a microcosm to this strategy was the Neutralization of Rabaul. The port of Rabaul in the South Pacific was captured by the Japanese in early-1942, who then made it a massive fortress and operating base for the Imperial Army and Navy during the Solomon Islands and New Guinea Campaigns. Even by late-1943 with encroaching American forces, the base still had many defenses and at least 100,000 Japanese troops & personnel ready to fight off any enemy assault. So rather than try to assault Rabaul itself, General Douglas MacArthur came up with a different approach: Allied forces would capture the surrounding islands, build airfields on them, and launch continuous air raids on Rabaul to destroy its ships, planes, and air-defenses. By doing so, the Americans & Australians were able to contain and trap the over 100,000 enemy forces on Rabaul with minimal effort and casualties, rendering the base utterly useless for the Japanese. Rabaul would still technically remain under Japanese control, but it was isolated and surrounded on all sides until the end of the war.
- Computer security is pretty much governed by this trope. Unlike other security systems, an attacker doesn't get hurt if they fail to break in, so they simply try every conceivable way into a system. And unfortunately, some of these ways are so outlandish the designers never considered testing against it, such as using a laser to make Google Assistant think you just told it to open the front door.
- There is an expression "The user is the biggest threat to any security system." There are branches of mathematics devoted to developing crypto-systems that are pretty much mathematically guaranteed to be secure. However, once these systems are developed, they are turned over to people who use passwords like "password" or leave their login information on a little sticky note on the monitor. Even worse, there's the concept of "Single Point of Failure": basically, if each part of your system is secured with a different password, a cracker who gets just one of those passwords will have a hard time doing much damage. But if you use the same password for everything, you're hosed. Annoyingly, even if all users have really good password security, they're still vulnerable to what is euphemistically called "lead-pipe cryptanalysis", aka "beating up the guy until he tells you the passwords", as demonstrated by this xkcd strip.
- Similar to the Cryptography above, there is what's called "Social Engineering". It doesn't matter how good your physical or electronic security is if the people using it can be tricked into giving away secrets or clearance. A very simple example: you can have a door that requires fingerprint scans, iris scanners, a twelve-digit password, and a vocal print identification, but then you hold the door open for a thief whose hands are full of important-looking files, mistaking them for a coworker and being polite for someone who apparently belongs there. Companies who process a lot of data are constantly on the lookout for new ways of circumventing their data security, most of which come down to social engineering.
- There is an expression "The user is the biggest threat to any security system." There are branches of mathematics devoted to developing crypto-systems that are pretty much mathematically guaranteed to be secure. However, once these systems are developed, they are turned over to people who use passwords like "password" or leave their login information on a little sticky note on the monitor. Even worse, there's the concept of "Single Point of Failure": basically, if each part of your system is secured with a different password, a cracker who gets just one of those passwords will have a hard time doing much damage. But if you use the same password for everything, you're hosed. Annoyingly, even if all users have really good password security, they're still vulnerable to what is euphemistically called "lead-pipe cryptanalysis", aka "beating up the guy until he tells you the passwords", as demonstrated by this xkcd strip
- This trope is the reason why the Jules Rimet Trophy (the original FIFA World Cup trophy) was stolen so easily. When the Brazilian team won the cup for the third time in 1970, they were allowed to keep the real trophy in perpetuity, since Jules Rimet stipulated that in 1930. It was put on display at the Brazilian Football Confederation in Rio de Janeiro encased in bulletproof glass so it wouldn't be stolen. The problem was that the rear of the cabinet was made of simple wood, so in 1983 it was easily opened with a crowbar and stolen. Sadly, it has never been recovered.
- Truth in television: Some of the better deadbolts can withstand forces that would put a hole in an outer wall. And, of course, there are a lot of houses that have solid steel doors with deadbolts and security screen doors... and great big picture windows right next to them. This said, burglars would prefer not to break a window. It produces sharp shards of glass that might cut the burglar and leave DNA evidence, the sound of the breaking glass might attract unwanted attention and the sight of a broken window WILL attract attention (especially in conjunction with a burglar alarm going off). On the other hand, an open door will just make people think the owners forgot to shut it, unless it's hanging off its hinges. Burglars much prefer going in through the door.
- Straitjackets are designed this way, in that someone who's both mentally rational and moderately flexible can often work their way out of them after a few tries.
- A variation of this trope is occasionally invoked for hostage rescue; if the suspects have at least one firearm trained on each door or window, the safest way of gaining entry is to take a shaped charge to a wall and attack from an unexpected direction. Naturally, this solution is not employed unless the police or Special Forces team can obtain the building plans, lest they blow a hole in a load-bearing wall.
- During the Second World War Battle of Ortona, German forces were heavily entrenched in the houses of the town. Entering through the doors or windows was too dangerous, so the attacking Canadians simply blasted holes in the walls with their rocket launchers and anti-tank guns.
- Seismic bombs such as the Tallboy and the Grand Slam were developed to exploit this sort of thinking. Rather than try to break through a bunker's heavily-armed ceiling — which might be breached but would likely absorb most of the blast, protecting the occupants — these bombs were instead designed to penetrate deep beneath the ground next to the target and explode, undermining the foundations and causing the whole structure to collapse in on itself.
- German battleships Bismarck and Tirpitz had been built with tremendously durable hulls and armor, able to survive and move under their own power even after a direct hit from said Tallboy bomb. The direct hit had been a necessity since their armored decks were mostly impervious to standard Royal Navy 500lb and 1600lb bombs. Their stern construction, however, made it impossible to steer only via propellers and left most of the rudders and steering engines poorly protected. On top of this, the ship's superstructure wasn't protected from the Royal Navy's bombs, as adding that much armor protection to her upperworks would have left her dangerously top-heavy and vulnerable to capsizing in anything more than a gentle spring breeze. The Kriegsmarine knew that after Bismarck sea trials, but did not expect it to hamper the ship's fighting ability. Unfortunately it did, as a single lucky torpedo from a Fairey Swordfish biplane broke the rudders and left Bismarck a sitting duck in her first and last raid. The Royal Navy then closed in and hammered the ship with their "ineffective" artillery at close range until the ship was dead in the water, at which point either a lucky hit breached a hole in her armor or the German sailors scuttled her themselves. And so passed the end of the Bismarck.
- Warship armor protection evolved due to this trope. Originally, it was common for ships to have the thickest armor around the sides, bow, and stern, to protect from direct enemy gunfire. Improvements in artillery and range-finding led to the addition of armor protection against "plunging fire", as the longest ranged artillery would be fired on a ballistic trajectory. The introduction of sea mines and torpedoes necessitated armor protection under the waterline as well, and improvements in weapons technology led to "All-or-Nothing" armor protection, where all of the ship's most vital bits were packed together and encased in a heavy armored citadel, while the rest of the ship (galleys, living spaces, cargo holds, etc.), necessary to her operation but not to her surviving combat, was left almost entirely unprotected to leave the ship light enough to avoid speed and range penalties. Eventually, ship designers gave up on armor protection for the most part and now build lightly armored warships that are armed with massive batteries of anti-ship and anti-air missiles instead.
- Portable safes. If a thief gets into your house without raising an alarm, there's not much stopping him from just walking off with the whole thing. Many of these safes are designed to be bolted to the floor, but otherwise you've just made things into one-stop shopping for the thief. Also, some safes aren't really designed to protect from thieves at all — they're essentially a fireproof box to guard important documents from damage, not theft. Of course, many homeowners intentionally do this, in hopes that, if the burglars locate the safe early in their act of thievery, they would be less likely to ransack the rest of the house for more valuables and therefore limit property damage.
- The vault of the Société Générale bank in Nice had a door that was virtually impenetrable. But a group of criminals led by Albert Spaggiari managed to break in — by entering the city's sewers and digging a tunnel into the vault through its floor.
- Snopes confirmed a story about a Toronto lawyer named Gary Hoy who had a party trick of demonstrating the strength of his 24th-floor office's windows by hurling himself at them, until on July 9th, 1993 his luck ran out and he fell to his death. However, while one might assume the glass broke, it seems what actually happened is that the glass was as strong as he boasted; it just popped clean out of its frame. Structural Engineer Bob Greer told the Toronto Star, "I don't know of any building code in the world that would allow a 160-pound man to run up against a glass and withstand it." Presumably the repeated stunts had slowly degraded the frame and sealant, until it failed when he did it one time too many.
- Yoshie Shiratori, who holds a claim to fame of managing to escape from prison four times. After having escaped thrice he was placed in a supposedly inescapable cell: the walls were heavily reinforced, the only windows were smaller than his head, and there were six armed guards keeping watch on him 24/7. Rather ironically, it was his easiest escape attempt as they had neglected to reinforce the floor owing to his previous ones all having been done through windows or skylights, so Yoshie simply dug a tunnel out.
- When mobster Tony Spilotro decided to start carrying out burglaries while stationed in Las Vegas, he knew full well that most potential targets had alarms on the doors and windows. So he and his crew would drill through an exterior wall or ceiling to create an opening they could use to gain entry. This simple but effective tactic earned the group the nickname "The Hole in the Wall Gang".