Dr. Selvig: My calculations are far from complete. And [the Tesseract's] throwing off interference radiation. Nothing harmful—low levels of gamma radiation.
Nick Fury: That can be harmful.
So, you have an experimental piece of technology for which there is No Plans, No Prototype, No Backup, or is Imported Alien Phlebotinum. You're about to begin an important test, when somebody discovers a minor fluctuation in one of the readings. A higher-ranking scientist or military officer says that it won't affect the test. Except it almost always does. Sometimes it affects it to the point of a Tokyo Fireball.
This is a side-effect of The Law of Conservation of Detail. Minor fluctuations happen all the time in complicated experiments, but unless they're going to directly affect the plot, you won't hear about them.
Examples:
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Comic Books
- Avengers Standoff: Before the cosmic cube fragments start acting up, they begin throwing off gamma rays that are dismissed as being within parameters. A Mysterious Waif is born from this anomaly.
Fan Works
Crossovers
- Bond Breaker: Although the Corruption is visibly spreading, the Voices keep the experiment ongoing as everything is still within parameters.
Films — Animation
- Big Hero 6: While conducting the test of the teleporter, one of the technicians notes that some readings are off, but his superior brushes it off after checking on it and declaring it within acceptable parameters — likely due to the fact that the military is watching the experiment. The teleporter ends up sucking in the test pilot and stranding her in an Acid-Trip Dimension.
- Cloudy with a Chance of Meatballs: Flint builds a danger meter for his food machine. When his popularity skyrockets as a result of it, the Mayor starts pushing him to always use it, making the needle go nearer and nearer to the red zone. At last, Flint sees it in the yellow zone but then hits the meter so it goes back to green. Soon enough, the machine goes rogue and decimates the world's climate with food precipitations.
Films — Live-Action
- The Avengers (2012):
- The film begins with SHIELD poking the Tesseract, which has suddenly "woken up" and is refusing to turn off the device it's attached to. Despite this, Dr. Selvig isn't too concerned. Hawkeye, meanwhile, very much is, a fear proven when the minute he airs his concerns the Tesseract opens up a portal.
- Subverted in the same film when Dr. Selvig notes the "low levels of gamma radiation" emitting from the Tesseract. Fury expresses concern, but the reference to gamma rays is just a Continuity Nod to the Hulk’s Super Hero Origin, and has nothing to do with what actually goes wrong a few minutes later.
- Galaxy Quest: After Sarris' ship gets destroyed, Alexander notes that there was "an energy surge from Sarris' ship". Of course, this detail comes to bite the crew in the ass, immediately.
- Spider-Man Trilogy:
- Spider-Man 2: When Otto Octavius's fusion experiment first starts going awry, he's so invested in the fusion working that he ignores all the tells that the reactor is becoming dangerously unstable.
- Spider-Man 3: The scientists running an experiment involving a particle accelerator and sand notice that the weight of the sand is greater than expected. They write it off as a bird that will fly away once the experiment starts. The "bird" is actually Flint Marko, about to be turned into The Sandman. One wonders what 200-pound bird the scientists were thinking of.
- Star Trek: First Contact: When the Phoenix launches, a red light comes on, which Zephram attempts to fix by the age-old "hit it hard" method. When it stays lit he says "Ignore it". Subverted: It turns out not to be an issue, and the flight is successful.
Literature
- Catch That Rabbit: While supervising, the DV-5 central unit and its subsidiary devices function within acceptable parameters, but under certain conditions, they stop working for hours at a time.
- The Thor Conspiracy: A single signal is wrong on the test boards for a nuclear test launch being held in the South Pacific. The error causes the missile to go off inside the ozone layer, catching it on fire. Not a perfect version of the trope — the signal on the board was green at the time of launch, but had been red earlier, and they refused to let the technician who had noted it halt the launch countdown for a systems test.
Live-Action TV
- Stargate Atlantis: In "The Return", while testing the intergalactic gate bridge, McKay picks up an ancient warship and so dismisses it because it's actually a non-threat. This was probably to subvert audience expectations after an earlier episode featured readings "within parameters" that eventually blew up a solar system. Which was brought up several times later, much to Dr. McKay's ongoing chagrin.
- Stargate SG-1: Justified Trope. Sam notices that the power level of a force shield surrounding the town they are in (protecting it from the poisonous wasteland outside) is dropping. The other scientist present insists it is nothing. He is being brainwashed by the computer that manages that shield.
Video Games
- Half-Life:
- Half-Life 1: Almost this exact phrase is uttered in the opening scenes; soon afterwards some rather unpleasant creatures make their debut.
"Uh, it's probably not a problem, probably, but I'm showing a small discrepancy in... well, no, it's well within acceptable bounds again. Sustaining sequence."
- Half-Life 2: Subverted Trope in Episode Two, when the project appears to work without a hitch despite the "eight and a half pound anomaly". Of course, the anomaly in question is Dr. Kleiner's pet, Lamarr, setting up a nice Chekhov's Gun for future installments, on the rare chance Valve remembers Half-Life exists and releases Episode 3.
- Half-Life 1: Almost this exact phrase is uttered in the opening scenes; soon afterwards some rather unpleasant creatures make their debut.
- Helldivers II: Despite the 'completely necessary' loss of three planets in Operation Farsight Breach, Terminid containment was still deemed to have fallen within acceptable parameters at the order's completion.
- Trinity: You have to sabotage the eponymous atomic bomb test in a way that will be written off as within parameters.
Web Animation
- How It Should Have Ended: It parodies the Spiderman 3 scene. The third scientist angrily demands that the other two actually make sure the disturbance in the silicon mass is a bird and not, you know, a mutated being.
Web Original
- In this
Apocalyptic Log on YouTube, Petty Officer John Deadman (Alasdair Beckett-King) records that "readings are all still within acceptable parameters" on Project Hubris, even after the captain has eaten his own face. Viewers may guess that John isn't going to make it home to his wife and/or kids.
- CDT Resort: Kokabiel says of the lower probability for sapphic orientations sprouting in female individuals that "It's probably just a statistical anomaly due to small sample size."
Real Life
- Truth in Television. The inherent variability of the human body can mean that, in the results of medical testing, a slightly off-average result can still mean that a disorder is present. Because it usually means absolutely nothing, and responding to it generally does nothing but waste time and money (and sometimes hurts the patient as a side-effect of unnecessary tests), doctors have learned to ignore these anomalies — which works fine, except when there really is a big problem to worry about.
- Scientists know that the results of their experiments have a lot of variability, and have to train themselves to ignore what seem to be patterns but aren't — which means that, occasionally, they miss a pattern that really exists.
- The Chernobyl nuclear disaster happened as a result of this — the inexperienced-in-comparison control room crew had no idea of what was actually going on in the reactor, relying on instrumentation that claimed the water level and the power level was fine. The only problem was the readings were absolutely wrong, and correcting for them only worsened the problem — and by the time the instruments caught up to reflect the problem (loss of water coolant), the situation was absolutely irreversible. A second and even more tragic form also happened at Chernobyl: radiation monitoring systems such as dosimeters were overwhelmed by the amount of radiation, either malfunctioning or showing top normal readings — the end of their range, which convinced people they were safe on site as opposed to being lethally irradiated.
- At least two BP plant explosions (Texas City and the Macondo/Gulf well blowout) had this as a major feature — the readings seemed to be within normal limits, but actual conditions were far, far more dangerous — and combined with multiple Failsafe Failures, the result each time was literally explosive.
- One quirk of the NASA space shuttle's unique launch profile was that during ascent, chunks of foam insulation would sometimes break off the tank or the solid rocket boosters and fall onto the orbiter's heatshield at Mach speeds. While this was obviously not ideal, as flight after flight returned from orbit without any major damage, NASA gradually became desensitized to the problem, even after a foam strike during STS-27 nearly doomed the shuttle Atlantis in 1988. Sadly, they waited too long to fix the problem, and in 2003 the shuttle Columbia — returning from orbit after sustaining a foam strike during ascent — disintegrated during re-entry, killing all seven astronauts on board.