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->''[beginning of the movie]''\\
'''K:''' Whoa there! Don't push that. Never, ''ever'' push the little red button.\\
''[end of the movie]''\\
'''K:''' Remember the little red button? [[GodzillaThreshold Push the little red button]]. [[NitroBoost And you may want to put on a seatbelt]].
-->--''Film/MenInBlack''

Remember the ChekhovsGun that was on top of the mantel? The one Little Bobby was told ''never'' to touch, under ''any'' circumstances? Now's the time to grab it. This is a specific subtrope of the ChekhovsGun where someone points out the "gun" and ''explicitly warns against using it''. It doesn't have to be a MatterOfLifeAndDeath. It can be as simple as being told not to push a button, then later being told to push it.

In general, whenever someone says "Don't touch that, it's only to be used in ''extreme'' emergencies", there '''''[[ChekhovsGun will]]''''' be an extreme emergency later on. As a [[GodzillaThreshold desperation maneuver,]] it invariably works. (Remember, [[MillionToOneChance desperation maneuvers ALWAYS work]].) In fact, if a character at any point says, "Don't ''ever'' do that!", it's ten to one that very thing ''will happen'' by the end of the story (whether on purpose or by pure accident).

Often used in conjunction with a GodzillaThreshold. Compare DangerousForbiddenTechnique. ''Mildly'' related to ExplosiveOverclocking, TemporalParadox, and FinishingMove.

----
!!Examples

[[foldercontrol]]

[[folder:Anime and Manga]]
* In ''Anime/CastleInTheSky'', Sheeta mentions to Pazu that her pendant has a spell of destruction that her grandmother taught her, but told her never to use. Guess what they end up using at the end of the film?
* Aban from ''DaiNoDaiBouken'' developed [[DangerousForbiddenTechnique Grand Cross]] as a GodzillaThreshold skill. He specifically states that it's only intended to be used when everything else has been tried, which warns the viewer this [[ChekhovsGun skill]] will only be used at a story climax.
* ''{{Slayers}}'' offers another example with the Giga Slave. In order to keep it from being Lina's answer to every problem, a GodzillaThreshold aspect was introduced. Lina learns that the spell could cause the world to turn to chaos, and vows to never use it again; naturally, she's forced to do so at the end of Slayers Next.
** It's not always used when there's a climax. The end of season 1, like the end of NEXT, is one big attempt to get her to perform the spell. She doesn't. Almost the entirety of Try, once the characters learn who the BigBad is, is about finding a way NOT to use it. They succeed, but Lina always accepted that she may have to use the Giga Slave if their plan didn't work.
* Sugata of ''Anime/StarDriver'' has access to an extremely powerful first phase ability, the King's Pillar. However, every previous bearer of Samehk's mark who used the ability never woke up again. The time comes when he has to protect Wako, and well, you can guess what happened. Luckily for Sugata, his [[LevelUpAtIntimacyFive libido]] was strong enough overcome that effect.
* Madoka in ''Anime/PuellaMagiMadokaMagica'' is essentially a Forbidden ChekhovsGunman. Kyubey repeatedly states that she'd have incredible, godlike power if she made a contract, but the other girls--especially Homura--keep preventing her from going through with it. [[spoiler:Eventually, it becomes clear that her transformation would probably cause TheEndOfTheWorldAsWeKnowIt, because she'd soon become the witch to end all witches. Homura ''knows'' this would happen; being a time-traveller, she's seen it firsthand. But Madoka eventually makes a contract in a way that prevents the cataclysmic downside.]]
* Plan Z was first brought up in chapter 44 of {{Manga/Green Worldz}} but never revealed its purpose, only that it should only be used as a last resort. It was later used by Iwatobi to restore his original fighting capabilities at the expense of his life as it heavily burdens his heart.
[[/folder]]

[[folder: Comic Books ]]
* In ''TheFlash'' storyline "Terminal Velocity", Wally has various reasons to believe that pushing his superspeed too far is a GodzillaThreshold that will draw him into the Speed Force, never to return. He tries to avert a conflict which he knows will force him to do this, but to no avail. However, when he does finally enter the Speed Force, he manages to return (which no one has done before) thanks to ThePowerOfLove.
* In the {{Asterix}} comic series, Getafix does not allow Obelix to drink the magic potion, as he fell into the cauldron as a boy, and an extra helping could have bad effects on him. But in one story, ''Asterix and Cleopatra'' (both the comic book and the animated version), Getafix gives him just a drop of potion to give him extra strength in a difficult situation.
** Also overlaps with GodzillaThreshold.
** It's [[JustifiedTrope justified]]: a later book showed that if Obelix drinks a large amount of potion, he'll be [[TakenForGranite turned to granite.]]
* Fone Bone, Gran'ma Ben, and one of the Dreaming Masters were the only people who didn't want to do it, but near the end of {{Bone}}, the Crown of Horns seems to be the only way out, even though it's been said that if Thorn even touches it, all of existence would be in jeopardy, and the trip there would be dangerous anyway with all the dragons that guard the Crown of Horns and intend to kill anyone who's anywhere near it.
** [[spoiler: Fone Bone improves their chances by not actually touching it, just grabbing Thorn's hand and ''almost'' touching it via static shock.]]
* All Black the Necrosword in ''Thor: God of Thunder'', the weapon of Gorr the God Butcher. It turned a fairly spindly and starved mortal into [[GodOfEvil an abomination]] that pummelled three different versions of Thor (young Thor, present Thor and Skyfather Thor) into the metaphorical dirt. Unfortunately, it tends to have a rather detrimental effect on the wielder's sanity.

[[/folder]]

[[folder:Film]]
* About a third of the way into ''Film/FantasticFour'' when the Four are running tests on their capabilities, Johnny gets so hot he melts the walls of the test chamber. Reed stops the test with fire retardant foam, then explains to him that he'd gotten [[SciFiWritersHaveNoSenseOfScale almost as hot as a supernova]] and that this was bad. [[spoiler:During the fight with Dr. Doom at the climax, Reed tells Johnny to go supernova inside Sue's forcefield to try and melt Doom.]]
* The Omega 13 from ''Film/GalaxyQuest''. Somewhat played with. None of the characters even ''know'' what it does, including the aliens who built it. So they don't want to use it, because they don't know what it will do. The reason nobody knows what it does as it was only mentioned before the [[AliensStealCable cliff-hanger ending of the two-part episode that was never finished when the show was canceled]].
* ''Film/{{Ghostbusters}}'' has the iconic warning "Don't cross the streams," which they inevitably have to do at the end of the movie. As former TropeNamer, it was also causing confusion, since this overlaps with GodzillaThreshold. In this case, the non-disaster when they do end up crossing the streams makes internal sense: they are firing into a [[spoiler:ParallelUniverse EldritchLocation where a dark god trying to destroy the world is based, and presumably, [[InferredHolocaust the disaster Egon predicts happens]] '''[[InferredHolocaust there]]''' - and closes the gate]].
* The [[SuperPrototype Gunstar's]] [[SpinAttack Death Blossom]] attack in ''Film/TheLastStarfighter''; not so much that's it's insanely overpowered (although it is) as that it leaves the ship vulnerable just before and after it's engaged.
** More to the point, Death Blossom had never actually been tested; Grig worried that it might cause an overload and blow up the ship.
** It's worth noting that the Death Blossom is never mentioned in the novelization, and instead is a prolonged space dogfight sequence. One wonders if it was a last-minute addition to cut down on film time (and CGI costs).
* In the ''Film/LostInSpace'' film, ships have hyperspace engines, but it is not a good idea to jump without coordinates or a jump gate as [[YouCantGoHomeAgain the exit vector would be random]]. The crew does this anyway when the ship is sabotaged and crashing into the sun.
* Agent J in ''Film/MenInBlack'' is told by Agent K to never, ever touch the red button inside their car. When the two need to get across the city in a hurry and the tunnel is jammed, he is at last told to push the button -- transforming the car into a high-speed rocket that drives along the ceiling of the tunnel.
** In the second movie Jay uses "Pressed the Red Button" as a type of code, indicating that it is reserved only for the [[GodzillaThreshold biggest emergencies]]. They seem to prefer to not even use the neuralyzer if they don't have to, so going for a rocket car ride would likely be a last ditch number on their list of priorities.
* In ''Film/{{Orgazmo}}'', Choda Boy swears off using his dangerous "Hamster Style" at a young age due to its unpredictability, but at the movie's (heh, heh) climax, he employs it with great results.
* In ''Film/TheAvengers'', the whole team (minus [[BullyingADragon Tony]]) spends a lot of time trying to keep Bruce Banner calm. Then the alien invasion arrives.
--> '''Captain America:''' Dr. Banner! Now might be a good time to get angry.
* ''TheFastAndTheFurious'': The Dodge Charger in Dom's garage belonged to his father and nobody, not even Dom, dares drive it...until the last ten minutes of the film.
* Early in the Australian lawn bowls comedy (uh huh) ''Crackerjack'', Jack tries a "flipper" - in short, a cricket thing transposed to lawn bowls - with disastrous results. He's angrily told never to pull that crap again, but when he has to pull off an almost impossible shot in order to win the championship, he's explicitly instructed to do it.
* In ''Film/TheRundown'', Beck refuses to use guns because "bad things happen" when he does. In the final showdown he realises [[BatmanGrabsAGun he has no choice]], and bad things do happen...to countless mooks.
[[/folder]]

[[folder:Literature]]
* In the novel ''FoundationAndEmpire'', Devers is trying to escape Trantor, with the police in hot pursuit, since [[spoiler:he just killed a Lieutenant]]. He enters hyperspace very close to the planet, which could kill him.
** It is promptly indicated that doing a BlindJump like Devers did isn't actually all that dangerous, assuming you have enough supplies -- if you vaguely target empty space (Devers skimped on calculations, and the higher the gravitational pull, the more complicated the calculations), you have a very good chance of arriving in empty space. The problem is that it is ''only'' useful to desperately flee, since you then have to spend a lot of time figuring out where you are before you can travel anywhere. Doing a semi-blind jump ''to'' a system, on the other hand... [[spoiler: thus rendering this a cross-story Gun within the novel, since the protagonists of the second half of ''Foundation and Empire'' have to do exactly that]].
* The Door to Nowhere and Nowhen serves this function in ''TheRedemptionOfAlthalus''.
* ''Literature/{{Discworld}}''
** In ''Discworld/TheColourOfMagic'', one of the '''eight spells''' (eight is an important number on the Disc) has lodged itself in Rincewind's mind. He doesn't know exactly what it does, but popular wizarding opinion is that it will destroy the Disc (especially if cast alone). As a semi-sentient entity, it tries to cast itself. Rincewind ''barely'' prevents himself from casting it several times through the course of the first two books (which is one story) ''Discworld/TheColourOfMagic'' and ''Discworld/TheLightFantastic''. [[spoiler:When he does lose control, a significant event is already happening and the seven other spells have been cast. At this point, it's '''not''' a spell to destroy the world... but to create others.]]
** In the back-story of ''Discworld/GoingPostal'', an automatic letter-sorting device with extradimensional components (it accesses a dimension where pi is exactly equal to 3) goes out of control, filling the Ankh-Morpork Post Office with letters. Wizards called in to inspect the device warn that shutting it down is likely to destroy the universe. Fed up with the machine, a veteran mail-carrier starts smacking the device with a crowbar until it shuts down. When the mail-carrier started hitting the device, the wizards ran away. As the doer of the deed testified; unless they had some other universe to run to, they weren't really sure about the danger. The wizards insist that the universe ''really was'' destroyed, but was instantaneously replaced by a complete, identical universe. [[spoiler: That exact thing has actually happened before in that series. Twice, depending on how you count.]]
*** An unusual example, in that this was a ending-the-universe danger, but never actually crossed the GodzillaThreshold before it was destroyed.
* As per [[WordOfGod Word Of Jim]], [[Literature/TheDresdenFiles Harry Dresden]] will eventually break all seven Laws Of Magic.
* The ChroniclesOfThomasCovenant (at least the second one), after spending the last two series trying to prevent Lord Foul from obtaining Covenant's [[CosmicKeystone white gold ring]] in the final confrontation [[spoiler: Covenant just hands him the ring. It turns out to be a massive BatmanGambit, as Covenant had finally come to understand how the white gold worked, and was able to trick Foul into destroying himself with the power.]]
* Literature/ThursdayNext has a switch located behind a pane of glass to break in event of "unprecedented emergency" -- with the explicit note that "personal destruction" is not an unprecedented emergency. Unusually for this trope, the glass is ''not'' broken by the end of the book - but [[spoiler:it is broken in the next book.]]
[[/folder]]

[[folder: Live Action TV ]]
* In ''Series/BabylonFive'', the "Bonehead Maneuver" as mentioned in the Season 3 premiere. You have two ways of going in and out of hyperspace. If your ship is powerful enough, you can open your own jump point, or, if your ship isn't that powerful, you have a Jump Gate open one for you. You never want to open a jump point inside a jump gate, because this causes one massive explosion of a NegativeSpaceWedgie. Aside from the loss of a very hard to replace jump gate (typically a star system will have one at most) and potentially stranding people in the system if they lack massive starships, this doesn't actually cause any huge universe-altering affects. Just a huge explosion that is difficult for most ships big enough to open a jump point to [[OutrunTheFireball outrun]] (so not really a GodzillaThreshold). They end up using the trick in a tricked-out new spaceship that MIGHT be fast enough to get away after using this trick to kill an enemy they DEFINITELY weren't big enough to fight.
[[/folder]]

[[folder:Radio]]
* In ''Radio/TheHitchhikersGuideToTheGalaxy'', it's generally a really bad idea to activate the Infinite Improbability Drive on the starship ''[[CoolShip Heart of Gold]]'' without proper programming, as '''anything''' could happen as a result. However, when confronted with imminent destruction by a pair of nuclear missiles, [[UnfazedEveryman Arthur Dent]] goes ahead and does it anyway, since [[GodzillaThreshold almost anything else would be an improvement]]. Luckily, the only thing that happens this time is a redecorating of the ship's bridge, and the two nuclear missiles being replaced by a live sperm whale and a bowl of petunias. (Also occurs in the book, TV series and movie adaptations.)
** If we knew why the bowl of petunias thought "Not again!" while falling, we would probably understand a lot more about the universe. [[spoiler:Later in the series, we find out EXACTLY why; it's one form of someone whose ''every'' incarnation keeps getting killed by Dent.]] ItMakesSenseInContext.
** Averted in the case of the button which, when Arthur pushes it, brings up a message that says "please do not push this button again". He doesn't push it again.
[[/folder]]

[[folder: Tabletop Games ]]
* ''TabletopGame/{{Warhammer 40000}}'' gives us [[ArtifactOfDoom the Spear of Twilight]], which will doom whoever removes it from stasis to death from a wasting curse. Prince Yriel saved his Craftworld from being eaten by Tyranids by using it.
* This is a commonly used tactic in ''TabletopGame/{{Fiasco}}'' playsets, as usually the goal of the game is to [[ItsAWonderfulFailure create as atrocious a mess for the characters as you possibly can]], so Objects (and, to a lesser extent, Needs and Relationships) with built-in bad ideas pretty much guarantees they'll be the centre of the action. A good example is one Object in "White Hole" - "Stasis gun. (Do ''not'' fire the stasis gun.)"
[[/folder]]

[[folder: Theme Parks]]
* In the Ride/MenInBlackAlienAttack ride at Universal Studios, a BigRedButton like the one mentioned in the above example appears in every ride car. Like in the film, you are told never to press it. However, by the end of the ride you face a giant alien that's immune to your weapons. Guess what you have to do?
** A cheesy instruction video seen while in line on the ride explains exactly WHY you don't press the button; it's a ''nuke'' capable of frying the more {{Kaiju}}-esque aliens.
[[/folder]]

[[folder: Video Games ]]
* somewhere in the beginning of Borderlands 2, Claptrap tells you of a gun he keeps in his cabinet, but "only for emergencies." [[spoiler: there was an emergency.]]
* PressXToDie is a video-games-specific instance of this, in which the game will '''[[SchmuckBait really]]''' be over if the player actually fire the forbidden gun. Usually, the gun is some kind of weapon of mass destruction.
* In the first ''ShadowHearts'' game, all characters have a Sanity stat during battle. If this reaches zero, the character goes berserk, attacks their allies, and will not gain experience if you win the battle. The strategy in many difficult battles involves keeping this stat up while various effects suck it away. How does one unleash the final, most powerful transformations of the main character? By leveling the transformations up to max and then going insane while fighting in them. Something of a GuideDangIt.
* In the ''Franchise/{{Ultima}}'' series, the Armageddon spell (which kills everything and destroys the entire world when cast) has always just been used as a RedHerring to give the player a NonStandardGameOver, but by sealing oneself inside the separate universe made by a Barrier of Life spell with the BigBad in ''VideoGame/UltimaIX: Ascension'', the player is able to destroy just the universe he's in right now, along with his opponent and himself.
* The first ''Franchise/{{Halo}}'' trilogy had you trying to prevent the Halos from going off. Guess what the last level of ''VideoGame/{{Halo 3}}'' has you doing? [[spoiler: It was only one Halo, not the whole set,]] but the concept remains the same. Cortana even handwaves it. The reason for trying to prevent that is that the Halos are meant to kill all life in the galaxy. [[spoiler: The one in the third game is outside the galaxy as noted in the first level on the Ark. One marine points out that the Milky Way is visible in the sky, meaning you're not in it.]]
* In ''VideoGame/BreathOfFireDragonQuarter'', Ryu must unleash D-Breath against [[spoiler:Chetyre in the true final battle]] until the D-Counter hits 100% to trigger the final scene - an action that earns a NonstandardGameOver everywhere else.
* ''Destroy All Humans! 2'' this trope is played for laughs in one of the final missions. In order to stop the superweapon going off, Crypto must cross the beams of a targeting system. The entire Ghostbusters conversation is used verbatim on why this would be a bad idea.
* In ''SouthParkTheStickOfTruth'', the hero swears an oath never to fart on a man's balls, and is discouraged from this multiple times throughout the story. However, [[spoiler: the hero is forced to fart on Zombie Nazi Princess Kenny's balls in order to defeat them.]]
* In ''VideoGame/CastlevaniaOrderOfEcclesia'', using the [[spoiler:Dominus Anger, Dominus Hatred, and Dominus Agony glyph union kills Shanoa instantly.]] Guess what you have to do to beat the final boss? [[spoiler:Though, as a result of a HeroicSacrifice, Shanoa survives. Turns out that the glyph consumes ''a'' soul, not necessarily ''the user's''. It just so happens that Albus was forced to hang around after his defeat and was able to take Shanoa's place. This is in the Good End. The Bad End has Shanoa die after using the glyph.]]
* ''FateStayNight''. Specifically, using Excalibur, the first DeusSexMachina (maybe), Shirou's arm, taking on Caster/Kuzuki directly on their turf (not a dangerous ''technique'' but the strategy is essentially suicide) and projection in general. Maybe it would have been best to simply leave this with no details considering how prominent this is?
* '[[{{Tsukihime}} Shiki]], you've got about thirty seconds before Roa takes over your mind? ''What are you going to do now?''' Answer: Stab himself in his own point of death on the assumption that if his will is stronger than Roa's, he'll live through it and Roa will die instead. Still, it's not like Ciel had any other ideas, and Arcueid provided backup by way of a single drop of her blood. (Thus sharing her will with his and allowing him to overpower Roa with relative ease.)
* In ''Franchise/{{Pokemon}}'' - [[TakingYouWithMe Perish Song.]] Especially if you're in a double battle.
* ''{{Magicka}}'' lets you do this with the Arcane element and other elements to alter the beam's qualities, resulting in a combined, powerful beam. But if beams of opposing elements cross, a huge explosion occurs that will likely kill anyone nearby. Players may exploit this when fighting goblin shamans and other enemies that use beam attacks, intentionally or accidentally.
* In ''VideoGame/FinalFantasyVIII'', [[spoiler:Ultimecia's end goal is to compress time. Because she exists generations into their future, the heroes end up having to allow her to begin time compression so that they can get ''to'' her to prevent her from compressing time.]]
* Happens again in ''GhostbustersTheVideoGame'', [[spoiler: except this time due to being in the ghost world - where the same rules of physics don't apply, such as the lack of gravity on the actual landmass - one can probably assume that you can [[ForbiddenChekhovsGun cross the streams]] without frying your ass to bits because the chances are ''reversed'', thus making it more safe to try.]]
* The Great Clock's purpose in ''RatchetAndClankFutureACrackInTime'' is specifically stated several times throughout the game to be ''maintaining'' time, not reversing it. Time-travelling with it would cause the entire universe to collapse on itself. Naturally, [[spoiler:Clank has to use it to turn back time by only a couple of minutes at the end of the game after [[WellIntentionedExtremist Azimuth]] kills Ratchet]].
* The command that stops the BigBad from sacrificing you to end the world in ''[[VideoGame/ChzoMythos Trilby's Notes]]'' is [[spoiler: DIE. Yeah.]]
* ''MetroidOtherM'' combines this with ATasteOfPower for the [[spoiler:Power Bombs]]. You test them out in the beginning of the game, and are promptly told to ''never'' use them, and in fact attempting do so will fail. [[spoiler:Until the final boss, where you HAVE to use them after being swallowed.]] Also a GuideDangIt since you have, most likely, completely forgotten they exist by that point and wouldn't think to use them after all the hubbub about not using them previously.
* ''VideoGame/{{RuneScape}}'': {{Downplayed}} in the Rune Mysteries quest. You're warned not to play the lower registers on the giant organ because it'll make a loud noise and annoy everyone in the tower. Later, at the end of the quest, you need to bang on the keys to create a distraction.
* The ''{{Lemmings}}'' series has the Nuke button, which can be used for a mass mercy killing if you screw up the level, or to sacrifice extra lemmings once you rescue the required amount.
* The Evil Ring in the first ''{{Ys}}'' game normally kills you if you equip it. However, you later need to use it in combination with the Blue Necklace to access the area where Lair is imprisoned.
* ''VideoGame/SuperRobotWarsUX'': The Orphes' Lepton Vector Engine which is a portable "Particle Acceleration Reactor". Basically what it can do is bypass space and time but the problem is that it damages human organs through continuous use. Think of it kinda like a semi-time machine but the pilot's getting microwaved.
[[/folder]]

[[folder:Webcomics]]
* This is the same way ''[[Webcomic/EightBitTheater 8-Bit Theater]]'' character Red Mage's Ice-9 spell (a reference to the novel ''Cat's Cradle'') works: as [[http://www.nuklearpower.com/2004/11/25/8-bit-chronicles-2-of-3/ the description]] puts it, it removes all heat from the universe it is used in, thus destroying all energy. He can only use it on other dimensions, like a bag of holding that he shoved an enemy in... which White Mage then smashed with a hammer.
* ''BobAndGeorge''[='s=] ultimate team-up attack is named as such, and is described by Bob that [[http://www.bobandgeorge.com/archives/index.php?date=011217 it'll definitely kill Mind, but might kill him, George and Dr. Light in the process.]] [[MillionToOneChance They decide to attack anyway.]] Bob and George first shoot streams of fire and lightning energy at Mynd, then [[http://www.bobandgeorge.com/archives/index.php?date=011219 Bob channels his fire into George]], the end result being exponentially more powerful than the two alone.
[[/folder]]

[[folder:Web Original]]
* Played for laughs in ''AVeryPotterMusical'' in which Harry shouts: "don't cross the streams!" when the [[PowerTrio trio]] summon their Patronus.
** And [[strike: Milfoy]] [[strike: Malloy]] [[strike: Count Chocula]] Malfoy. But the dialogue the Ghostbusters use is used in AVPM as well, though to dicuss why Harry has to compete in the House Cup tournament rather than beam-crossing.
[[/folder]]

[[folder: Western Animation ]]
* ''JohnnyTest''--Johnny teams up with some villains to save the Earth, and they're told right before they head out to not use their powers while holding hands, since it could multiply their powers by 500% or something. Naturally, when their plans are thwarted, they turn to this. It ''sounded'' like the villains refused to do this, and Johnny teamed up with his... dog.
** The dog can talk, and they ''always'' team up.
*** They did this gag before. [[ShoutOut "We have to cross the creams!"]]
* In ''Film/OverTheHedge'', characters tell Hammy not to drink caffeine, it could be dangerous to him, as he's already hyperactive. Later, they tell him to drink caffeine to go into CaffeineBulletTime mode.
* In one episode of ''TheRealGhostbusters'', the [=GBs=] were falling toward a body of water from high enough to kill them on impact. Egon's solution? Have them fire at the water and cross the streams; the resulting explosion kicks up a huge column of water which breaks their fall enough for them to land safely. Upon landing safely, one of them asks how Egon knew it would have that effect. Egon's response? He didn't; he just thought it might help. We ''are'' talking about a guy who engaged in this exchange in the film:
-->'''Peter''': Egon, this reminds me of [[NoodleIncident the time you tried to drill a hole in your head]].
-->'''Egon''': That [[GoneHorriblyRight would have worked]] if you hadn't stopped me.
* In ''WesternAnimation/TransformersPrime'' the Autobots have the Spark Extractor in their inventory, they won't use it unless they really need to hit the Decepticons hard. [[spoiler: They use it when they are fighting them on Cybertron.]]
* In the classic LooneyTunes short "Design For Leaving," Elmer's house gets rebuilt with all kinds of futuristic gadgets (which don't work right, naturally). Among them is "this [[VerbalTic wed]] one, wight here," to which Daffy the salesman responds, [[BigNo "No no no no!]] Not the wed one! Don't ever push the wed one!" [[spoiler: It's to escape tidal waves. It elevates the house hundreds of feet up into the air. When Elmer pushes it at the end, Daffy comes by in a helicopter to let him know that "For a small price, I can install this little ''blue'' button to get you down."]]
[[/folder]]

[[folder: Real Life ]]
* The Manhattan Project. Scientists did experiments seeing how close they could get radioactive cores to going critical without ''actually'' making them go critical. They called this [[TemptingFate Tickling The Dragon's Tail]], and considered it a necessary but insanely dangerous thing to do. One core did accidentally go critical (very briefly) on two separate occasions, resulting in the deaths of two researchers and less severe cases of radiation poisoning for several others. They dubbed this one the [[NamesToRunAwayFromReallyFast Demon Core]]. And of course, there are two cases where they [[NukeEm very intentionally let the cores go critical]], but that was the point.
** There was some speculation that the detonation of the first thermonuclear device ''could'' cause atmospheric nitrogen to start fusing, which would have made our Solar system a binary, briefly. Preliminary calculations indicated it was a long shot but didn't rule it out completely; the probability was deemed high enough that they actually got someone to do the detailed calculations to prove it wouldn't happen.
* The Higgs Boson A.K.A The God particle. The way to discover it ''could'' turn Earth into a black hole. Or cause the vacuum of space to drop to a more "stable" state, [[TheEndOfTheWorldAsWeKnowIt destroying the universe as we know it]]. [[ConspiracyTheorist Y'know, at least according to weirdos and pseudoscientists]].[[note]]We're now ''pretty'' sure the LHC has made several Higgs, and if it destroyed the universe no one has noticed.[[/note]]
* When an instructor is teaching you to use a gun, whether or not it's for self-defense, the first thing they will teach you is to '''never''' point a gun at a human being, with the sole caveat "unless your life literally depends on it". This is of course to prevent IJustShotMarvinInTheFace. Sadly, not everyone listens.
[[/folder]]

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