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1[[quoteright:217:[[Webcomic/EightBitTheater https://static.tvtropes.org/pmwiki/pub/images/8bitlogicbomb_7154.PNG]]]]
2[[caption-width-right:217:And this is a better result than average.]]
3
4->'''Patrick Star:''' ''[sitting by campfire]'' Hey, if we're underwater, how can there be a-- ''[fire is extinguished]''
5-->-- ''WesternAnimation/SpongeBobSquarePants'', "[[Recap/SpongeBobSquarePantsS2E7PrehibernationWeekLifeOfCrime Life of Crime]]"
6
7One of the nice things about [[RealLife reality]] is that a person's existence is not decided by consensual agreement, [[GodsNeedPrayerBadly worship]], or logic. In fiction that is not always the case and one can disappear in a Puff of Logic.
8
9Maybe the characters live in a world where YourMindMakesItReal, or they have RealityWarper powers, failing at logic can be fatal, or the author [[RuleOfFunny likes a good laugh]]. Whatever the case, a convincing argument can make ''anyone'' [[CessationOfExistence cease to exist and disappear]]. However, this doesn't necessarily erase the character's prior existence up to that point; see RetGone for an instance when a character's entire past gets expunged as well.
10
11Compare CentipedesDilemma, GravityIsAHarshMistress, AchievementsInIgnorance, ReminderOfImpossibility, LampshadeHanging and TalkingTheMonsterToDeath. Contrast SelfInflictedHell, where a character is in Hell simply because he or she ''believes'' they are. Also contrast ClapYourHandsIfYouBelieve, in which faith makes something work or exist. Can be the end result of a LogicBomb. SuperTrope to ImNotAfraidOfYou. Sometimes might happen immediately after a character has proclaimed: "ThisCannotBe" Also compare NoOntologicalInertia, which is a (slightly) more realistic take on this trope. An OxymoronicBeing might be subject to this. When the effects are more widespread than a single being, that's RealityBreakingParadox.
12
13Often an illustration of ThePowerOfLanguage.
14----
15!!Examples:
16
17[[foldercontrol]]
18
19[[folder:Advertising]]
20* ''Advertising/{{Skittles}}'': In [[https://www.youtube.com/watch?v=2OqaVtCHIKY "Believe the Rainbow"]], three teens sit on a rainbow and enjoy their skittles. One teen wonders if the rainbow is just make-believe, and then the rainbow opens under him and he falls out of the sky, presumably to his death.
21* Advertising/WilkinsCoffee:
22-->'''Wilkins''': If you don't drink Wilkins coffee, you're not all there.\
23'''Wontkins''': [[CurseCutShort Ah, that's a lot of-]] ''(disappears)''\
24'''Wilkins''': In fact, without Wilkins coffee, you're no where.
25[[/folder]]
26
27[[folder:Anime & Manga]]
28* This is how Gremmy [[HoistByHisOwnPetard does himself in]] in ''Manga/{{Bleach}}''. Gremmy has the power to make anything he imagines real. He fights Kenpachi, who proves to be ''so'' scary that Gremmy starts thinking of him as completely unstoppable, which renders Kenpachi ''actually'' unstoppable. Then he tries to imagine that he was strong enough to beat Kenpachi, who he had already imagined to be unbeatable. The paradox of trying to be stronger than infinity causes him to explode.
29* This is the premise of ''Anime/{{Noein}}''. Two competing potential futures are battling to influence the past and cause their rival to cease existing. [[spoiler: The big bad is eventually killed by everyone refusing to acknowledge his existence.]]
30* In ''Manga/{{Hellsing}}'', this is how the mighty Alucard met his demise. [[spoiler: He absorbed the soul of Schrodinger - a Nazi catboy, who had the power to be everywhere and nowhere. Being anywhere ''in particular'' required him to be able to recognize himself, so when he lost self-awareness amongst the mass of souls within Alucard, he - and Alucard by proxy- vanished. Alucard only managed to come back by ridding himself of every soul ''but'' Schrodinger's, allowing him self-perception again.]]
31* In the prequel story to ''Manga/FairyTail'' a.k.a ''Fairy Tail Zero'', one of Mavis's companions is a girl name Zera who she saved a long time ago when they were kids. Time passes, they meet the other future founding members of Fairy Tail and have an adventure. However at the end of it, one of them, Yuri explains to Mavis that [[spoiler: Zera is just an ImaginaryFriend Mavis conjured up by her powers after the real Zera died from her injuries all those years ago. Once Zera confirms it, she starts to fade away as Mavis was unaware of this until being revealed the truth of such]].
32* The final arc of ''Manga/FireForce'' allows this to happen with the seams of reality breaking every which way. In one scene, a side character and his mother have a straw debate on the nature of fanservice and self exposure. In the middle of the side character's speech, he mentions that as he's a named character and she is not, she has no safeguards for her existence. The mother then instantaneously disappears and nobody questions it.
33[[/folder]]
34
35[[folder:Comic Books]]
36* ''ComicBook/DoomPatrol'':
37** In Creator/GrantMorrison's run, the [[MetaFiction metafictional]] world of Orqwith disappears from reality when Rebis exposes the contradiction at its heart (based on a [[KnightsAndKnaves Raymond Smullyan puzzle]]):
38-->'''Rebis:''' I've come to ask the question. One of you must have the answer. Why is there something instead of nothing?\
39'''Priest in Black:''' I am a liar and I do not know why there is something instead of nothing.\
40'''Priest in White:''' I am an honest man and I do not know why there is something instead of nothing.\
41'''Rebis:''' Tell me then, the Priest in Black, why is there something instead of nothing?\
42'''Priest in Black:''' There is something instead of nothing.\
43'''Rebis:''' Then you can't possibly exist.
44** In John Arcudi's run, the Robotman we had come to know fades into nothingness when Metamorpho notes he was believed dead for years, the Justice League had a file on the explosion that killed him and everything. It turns out that he was one of Dorothy Spinner's imaginary friends, her idealized version of Cliff -- he didn't know he ''wasn't'' the real Cliff Steele until someone suggested it.
45* PlayedForDrama in ''ComicBook/TheDreaming'' where the protagonist is a mysterious being named Dora who feels incredible anguish when someone utters the words "you're not real".
46* In the final issue of ''Suore Ninja'' (an Italian comic mercilessly satirizing the Catholic Church), UsefulNotes/ThePope has a bet with God with the fate of Earth, and bets he can prove that God isn't allmighty by having him create a rock he cannot lift, and claims victory when God successfully lifts it (if God can lift it, then he doesn't have the power to create something he cannot lift. Had he ''failed'', then he wouldn't have had the power to lift something). [[LampshadeHanging God promptly points out it's a technicality]], even if he decides to abide to the terms of the bet.
47* One ''Webcomic/{{Nodwick}}'' story sees the party 'defeat' a lich by smacking it in the head with a magic club that makes you smarter (called, the [[{{Pun}} "Clue-By-Four"]]). The lich, realizing that its status as TheUndead only prolongs its own agony and causes it to lash out on others thus making the universe a crappier place to live, promptly reasons itself out of existence.
48[[/folder]]
49
50[[folder:Fan Works]]
51* Mentioned in ''Fanfic/{{Unfamiliar}}'' when Alex tries to dispel Louise's notion that she is incapable of magic.
52* In this [[https://www.fanfiction.net/s/12834680/35/World-of-Light-The-Subspace-Emissary-II fanfiction]], when [[VideoGame/FZero Jody Summer]] refuses to let {{Franchise/Kirby}} and [[VideoGame/AnimalCrossing Villager]] continue down the race track since they're underage and don't have driver's licenses and need an adult who can drive to accompany them, Kirby summons a Warp Star and he and Village hop on and try to fly down the track. Jody shakes her head and objects, "And magical stars you can create out of nothing don't count either". This causes the Warp Star to shatter into tiny little projectiles and Villager and Kirby to drop to the ground and have to leave because there's (seemingly) no way to move on.
53[[/folder]]
54
55[[folder:Films -- Animation]]
56* In ''Animation/BoBoiBoyTheMovie'', Adu Du and Probe are thrown out of the Tengkotak spaceship and into the ocean. Probe comments on how well Adu Du is swimming, but Adu Du remembers that he can't swim, and proceeds to thrash and sink. Probe dives to save him, and Adu Du is grateful that Probe can swim. Wouldn't you know it, Probe suddenly can't swim either, and they both thrash in the water.
57* At the end of ''WesternAnimation/TheFlightOfDragons'', the main character defeats the BigBad wizard by telling him magic is impossible. Without belief, magic doesn't work and knowledge of science is incompatible with belief in magic.
58** It also backfires on him, since, by denying magic, he banishes himself back to "our" world.
59* In ''WesternAnimation/HelpImAFish'', [[spoiler:Fly defeats [[BigBad Joe]] by pelting him with semi-complicated questions, causing the fish to drink more and more of the Fish Antidote and become increasingly intelligent and more human-like. By the end, Joe becomes [[HalfHumanHybrid something out of a]] Creator/HPLovecraft story and Fly hits him with ''"Can a human breathe underwater?"'' and Joe has just enough time to bark out an indignant [[ExplainExplainOhCrap "OF COURSE NO-!" before he gasps his last]].]]
60* In ''WesternAnimation/MeetTheRobinsons'', thanks to TimeTravel, [[ChildProdigy Lewis]] defeats the BigBad simply by saying "[[spoiler:I am never going to invent you]]."
61* Similar to the above example, ''WesternAnimation/TheLegoMovie2TheSecondPart'' has [[spoiler:Emmett defeating Rex by deciding he won't become him.]]
62* In ''WesternAnimation/ThePiratesInAnAdventureWithScientists'', [[EveryoneCallsHimBarkeep The Pirate Captain]] boards a ship only to find it's a ghost ship. Once he realises the ship isn't solid, he falls right through it.
63[[/folder]]
64
65[[folder:Films -- Live-Action]]
66* In ''Film/CloakAndDagger1984'', Davey has Jack Flack, an imaginary spy that helps him out throughout the movie. After Jack convinces [[MyGodWhatHaveIDone Davey to shoot a bad guy]] that was trying to kill him, Davey stops believing in Jack, and [[TearJerker Jack just fades from existence]].
67* In the ''Film/FightClub'' movie, [[spoiler:Tyler disappears when the Narrator "kills him". That was a key point in the movie where the Narrator managed to take control of his own mind]].
68* In ''Film/LooneyTunesBackInAction'', when the FlyingCar the heroes are in is crashing, it stops a few feet off the ground, with Bugs Bunny noting they're out of gas. A bewildered Kate points out that it shouldn't work like that, causing the car to finish crashing.
69-->'''Bugs:''' ''(Sarcastically)'' [[YouJustHadToSayIt Thanks, Toots]].
70* ''Film/TheNeverendingStory II'': [[BigBad Xayide]] is the AnthropomorphicPersonification of emptiness. In the climax, [[spoiler: Bastian wishes "for [her] to have a heart". The result? She has a VillainousBSOD and sheds a SingleTear [[TearsOfRemorse Of Remorse]]. The embodiment of emptiness is no longer empty, resulting in her (violent) cessation of existence]].
71[[/folder]]
72
73[[folder:Jokes]]
74* Old joke:
75-->Two men are standing on a skyscraper. Suddenly, the first one jumps down. The other one expects him to die horribly, but to his surprise, the first guy just bounces off the pavement, bounces a few more times, until he comes to rest. The second guy inquires how this is possible. The first guy explains: "[[ClapYourHandsIfYouBelieve It's all in your mind]]. You just have to think you're a rubber ball, and you will bounce just like a ball."\
76"And everyone can do that?"\
77"Yes, everyone, it's the easiest thing. Try it."\
78The second man is curious and really makes the jump. All the time while he's falling, he thinks "I'm a rubber ball, I'm a rubber ball".\
79Then, shortly before hitting the pavement: "But what if I was a tomato?"\
80SMASH!
81** Alternate Punchline: "[[SuperDickery You're such an asshole,]] Franchise/{{Superman}}."
82* Descartes walks into a bar, the bartender asks him what he wants, and he orders a beer. He drinks it, and the bartender asks him if he wants another beer. Descartes says "I think not", and disappears in a puff of logic.
83[[/folder]]
84
85[[folder:Literature]]
86* ''Franchise/TheHitchhikersGuideToTheGalaxy'':
87** The TropeNamer, in which the Guide presents an argument against {{God}}'s existence. As the argument goes, God refuses to prove his own existence, because "proof denies faith, and without faith I am nothing." Man points out the Babel Fish as a "dead giveaway" - it's just too handy to have evolved naturally - causing God to vanish "in a puff of logic." The Guide then says that this argument has been universally rejected on the basis that it is [[LogicalFallacy profoundly stupid]]; just to start, the Babel Fish being made unnaturally doesn't mean God had to have made it. Of course, that doesn't stop in-universe writers such as Oolon Coluphid from cashing in on the argument.
88** The second book in the trilogy explains that if you are able to learn the trick of flying, the first thing anyone who sees you is likely to say is something along the lines of "My God, you can't possibly be flying" and it is vitally important not to listen to these people or they will suddenly be right.
89* In his ''Literature/MeditationsOnFirstPhilosophy'', Descartes actually ponders this by noting that if he wasn't thinking, then perhaps he would not exist. He goes on to state that, regardless of what else he may be wrong about, he must at least exist in the capacity of an entity that is capable of being wrong; if he doesn't exist in at least that capacity, then [[BystanderSyndrome it's not his problem]].
90* ''Literature/{{Discworld}}'' all over the place.
91** Belafon the druid with his flying rock in ''Literature/TheLightFantastic.''
92--->Belafon sat down with his feet dangling over the edge of the rock.\
93"Look, don't worry," he said. "If you keep thinking the rock shouldn't be flying it might hear you and become persuaded and you will turn out to be right, okay? It's obvious you aren't up to date with modern thinking".
94** As first seen in ''Literature/ReaperMan'', the Auditors of Reality believe that because mortals have a finite life and that anything finite is insignificant compared to the infinite length of the universe, to develop a personality is to become mortal and thus die. Any time an auditor starts using the first person singular, you can bank on it evaporating in a blue flame very shortly. The narrative notes that this is flawed logic, but the Auditors self-destruct too quickly to catch on.
95** The genie in ''Literature/{{Sourcery}}''. The characters wish to go someplace, so they all sit inside the genie's bottle for the ride. . . .''while they are carrying it'', so the bottle moves because it's inside the moving bottle. The entire setup is banking on the universe not noticing what they were doing, which backfires once one of the characters points out the conundrum. The Puff of Logic ensues.
96** In ''Literature/FeetOfClay'', it's stated that the standard protocol for dealing with bogeymen is to throw a blanket over its head. The reasoning being that since [[SafeUnderBlankets you can convince a bogeyman you're not there by hiding your head under a blanket]], the same logic can be applied to the bogeyman itself. Throw a blanket over the bogeyman's head and he'll be convinced that ''he '' isn't there and be stunned by the ensuing existential crisis.
97* In ''Literature/ThePedantAndTheShuffly'' by Creator/JohnBellairs, persuading hapless passersby that, logically speaking, they don't exist, is the wicked magician Snodrog's favorite trick.
98* In ''Literature/FightClub'', [[spoiler:Tyler Durden disappears when Marla shows up to confront the narrator, the explanation being that Durden was his hallucination, and not hers.]]
99* ''Literature/{{Nightside}}'':
100** Tommy Oblivion, the Existential Detective, can [[InvokedTrope cause]] things like this to happen. On one occasion, he immobilizes a couple of [[LivingStatue ambulatory statues]] by explaining all the reasons why it should be impossible for them to move.
101** Hell to Pay has a literal example. Taylor points out to the newly created God of Creationism that Creationism doesn't believe in Evolution and that Creationism has ''evolved'' into Intelligent Design, therefore disproving itself.
102--->"Oh bugger," said Chuck, as he disappeared in a puff of logic.
103* In the ''Literature/FengshenYanyi'', a certain Bi Gan was coaxed by Daji to have his heart removed. Thanks to Jiang Ziya predicting the whole thing, he was given a charm and some instructions to counter his death. Bi Gan carved his chest open, pulled his heart and then, walks out the palace without looking back. He manages to survive like that until somebody said that no one can live without a heart. He then collapsed and died on the spot.
104* ''Literature/TheDresdenFiles: Literature/GhostStory'' has a non-fatal example. Harry, who is a shade, is riding in a car. It occurs to him that, as a ghost, he is capable of moving through solid objects such as walls. This causes him to wonder what's keeping him in the car -- and as soon as he starts thinking this, he immediately slides through and out of the car. Ghosts in the Dresdenverse get most of their abilities through perception; since Harry had seen other spirits move through walls it became something he associated with them being able to do. Cars, on the other hand, he thought of as solid, because he rode in them often when he was alive. As soon as he started doubting whether or not it was, it ceased to be to his spirit form.
105* In the opening chapter of Creator/BillBryson's history of science ''Literature/AShortHistoryOfNearlyEverything'' the author invites the reader to consider the molecular reality of their existence:
106-->"It is a slightly arresting notion that if you were to pick yourself apart with tweezers, one atom at a time, you would produce a mound of fine atomic dust, none of which had ever been alive but all of which had once been you."
107* In ''Literature/TheLostYearsOfMerlin'' series, Merlin has to deal with people using AntiMagic, [[spoiler: which only works if the magic user believes its effect is real.]]
108* In [[Creator/MoWillems Mo Willems]]'s ''Edwina, the Dinosaur Who Didn't Know She Was Extinct'', the boy Reginald tries to [[InvokedTrope invoke]] this, presenting everyone with his arguments and studies about dinosaurs being extinct, apparently hoping that if he can convince everyone, then Edwina will just disappear in a puff of logic. Edwina doesn't disappear and the evidence of Edwina being right there for them to see is more convincing to people.
109* In the 1951 short story ''Built Down Logically'' by Howard Schoenfeld, two students come to the conclusion that their lecturer can't possibly exist. He instantly disappears, very nearly naming the trope as he does so:
110-->No sooner had he uttered these words than Hooper disappeared. His body became opaque, then transparent. Then there was a puff of smoke, and he was gone, the fact of his existence wiped out by the logical thinking of the two students.
111* ''Literature/JourneyToChaos'' plays this trope for laughs. Eric has a VisionQuest and goes for over a week without eating or drinking anything. Once reunited with his team, TheMedic says that he should have died by now. Eric pretends to keel over as a joke, leading to {{dope slap}}s and shouts of [[invoked]] DudeNotFunny.
112* In Creator/LarryNiven's short story "The Nonesuch", the human settlers of a planet inhabited by a telepathic predator solve the problem by [[spoiler: convincing themselves (and future generations) that the creature does not exist. When the creature tries to attack someone who sees it and refuses to believe that it's real, psychic feedback causes it to disappear until the would-be victim moves on.]]
113* In the ''Literature/{{Goosebumps}}'' book ''The Haunted Car'', the evil ghost possessing the car is destroyed when she realizes that she accidentally did a good deed by unknowingly saving the boy she was trying to kill. She had used mind control to force the boy to get into the car, but before she can finally kill him she sees that his house had caught fire and he would have been dead already without her actions.
114* Creator/NKJemisin's ''Literature/InheritanceTrilogy'': Godlings' power grows when they act according to their "[[OddJobGods affinity]]" and wanes when they act against it. When the God of Childhood learns that he's done something completely antithetical with childhood, [[spoiler:fathering a child of his own,]] he starts RapidAging to death.
115* In ''Literature/ThursdayNext'', the ChronoGuard is able to use time machines despite having no idea who invented them or how they work by assuming that ''someone'' must have invented them at some point and then sent them back in time. When a thorough examination of every second of history shows conclusively that nobody ever invented time travel, all the time machines stop working.
116[[/folder]]
117
118[[folder:Live-Action TV]]
119* An episode of ''Series/GilligansIsland'' had the title character manage to fly with fake wings. When Skipper points out this is impossible, Gilligan instantly crashed.
120* In the ''Series/{{Bottom}}'' episode where Richie and Eddie are trapped on the collapsing Ferris wheel, [[DeusExMachina God saves them from falling at the last moment]]. Then they remember that they're atheists, conclude that they must be hallucinating, and...
121* ''Series/DoctorWho'':
122** In the serial "[[Recap/DoctorWhoS6E2TheMindRobber The Mind Robber]]", the Doctor deals with the various monsters he, Jamie and Zoe encounter in the Land of Fiction by telling his companions to deny their existence. If everyone stops believing in these monsters, the threat is instantly removed.
123** In "[[Recap/DoctorWhoS36E6Extremis Extremis]]" Nardole deliberately steps outside the range of a set of projectors to test whether or not he's part of the projection. He is. The subsequent rendering errors consume him.
124* A ''Series/MontyPythonsFlyingCircus'' sketch
125** An apartment building built using the power of hypnosis. It would only remain standing as long as the tenants believed it was the best housing available. When interviewed, one of the tenants mentions that they used to live in a villa overlooking Nice. When the interviewer comments that the villa sounds much better, the tenant realizes it's true... and the building starts to shake. Fortunately, the man says "NO! NO! OF COURSE NOT!" Then the building changes back to normal, although some of the furniture (and the tenant) were a little shaken.
126--->'''Tenant:''' Whew, that was close.
127** Another Pythonic version of this trope was a short animation by Terry Gilliam of Creator/AugusteRodin's [[ThinkerPose The Thinker]] coming up with Descartes' "I think therefore I am." in a thought balloon. When a hand comes from off screen and deflates the balloon with a pin, [[OhCrap The Thinker looks up briefly in horror]], then disappears.
128* The final episode of ''[[Series/{{Blackadder}} Blackadder the Third]]'' has Prince George shot, then rising alive and well due to a PocketProtector. When he attempts to show it off, however, he can't find it, remarks "Damn, must have left it on the dresser this morning", and promptly dies.
129* Done in the second season of ''Series/TrueBlood'' in the case of the NighInvulnerable ancient Maenad Maryann Forrester. It's revealed by vampire queen Sophie-Anne that Maryann's powers are directly tied to her beliefs, stating everything in the universe imagined itself into existence. Thus by believing in her god Dionysus and becoming a maenad she was immortal. In the end Sam tricks Maryann into believing her god has returned from her sacrificial ritual by {{shapeshifting}} into a bull and then impaling her in the chest. [[spoiler: She is surprised when this happens, but rationalizes that if she is the final sacrifice for her god to come into the world, then she will accept it. She's shocked again when Sam morphs into his human form, questioning if there was even a god. This moment of vulnerability allows Sam to rip her heart out of her chest and crush it into the ground, finally ending her reign of hedonistic MindControl.]]
130* ''Series/LateNightWithConanOBrien'' had superhero parody Captain Punishment whose job is to rid the world of people who make bad puns. When Conan points out that his name (Captian ''Pun''-ishment) is itself a bad pun, he explodes.
131* The episode "The Mission" from ''Series/AmazingStories''. Here's the description:
132-->Directed by Creator/StevenSpielberg. A crippled [=WW2=] bomber returning to base no longer has landing gear, and the turret gunner is trapped under the belly, facing an agonizing gory death when they land without wheels. He desperately draws cartoon tires (a la ''Film/WhoFramedRogerRabbit'') but is running out of time. [[spoiler:The tires serve to safely land the plane, but disappear when the captain slaps him in the face to snap him out of the trance he's fallen into once he's safely out of the ball turret.]]
133* ''The Mark Steel Lectures'' profile of Rene Descartes (see above) includes a spot where Mark invites the audience to stop and think about whether they exist for twenty seconds (with "Life is But a Dream" playing behind) ended with a buzzer and the message "Stop Thinking Now!".
134* An episode of ''Series/TheWalkingDead2010'' has Rick have periodic telephone calls in an abandoned prison. A variation occurs on the final phone call, because once he discovers who his mystery callers are, the phone calls stop. How is this a puff of logic? Every caller [[spoiler: was someone who was already dead, including his wife.]]
135* In the ''Series/{{Supernatural}}'' episode [[Recap/SupernaturalS09E01IThinkImGonnaLikeItHere "I Think I'm Gonna Like It Here" (S09, Ep01)]], Dean disappears after Sam accepts death because Dean represented the part of Sam's mind who wanted to fight death.
136* An episode of ''Series/{{Scrubs}}'' has JD desperately hoping that a patient does not have cancer. When the good news comes in, the patient celebrates by taking a picture with all his friends. When [[OOCIsSeriousBusiness JD points out to him that he hates posed for pictures]] because they're not real, the patient responds "Come on JD, you know none of this is real." At that point, JD is instantly snapped out of his episode-long fantasy.
137* The short-lived Australian sketch show ''The Comedy Sale'' had a sketch in which two women discuss their everyday lives. It becomes increasingly apparent that they are the antithesis of middle class Australians in the early 90s, and the sketch ends with them both remembering that they don't exist and promptly vanishing.
138* Played with in ''Series/TheXFiles'' episode "Field Trip". When Mulder and Scully realize they're experiencing a shared hallucination, everything melts away to reveal that they are in a cave and are being slowly digested by a unidentified substance. Back in Washington, an increasingly unlikely series of events unfolds and eventually Mulder posits that they never left the cave, pointing out when a person is unknowingly exposed to a hallucinogen, becoming aware of it doesn't negate the effect. The hallucination wears off shortly after when they are rescued for real.
139[[/folder]]
140
141[[folder:Music]]
142* In the [[Music/JonLajoie WTF Collective 3]], [[ExactlyWhatItSaysOnTheTin MC Uses Time Machines Irresponsibly]] vanishes into thin air after he realizes that hanging out all night with his parents on the day he was conceived [[TimeParadox didn't leave them any alone time, thus preventing his own conception]].
143[[/folder]]
144
145[[folder:Newspaper Comics]]
146* A [[EnemyWithout duplicator story]] in ''ComicStrip/CalvinAndHobbes'' ends this way. Calvin made [[MorallySuperiorCopy a clone of his "good side"]] to do his chores and go to school for him. They got into an argument over Good Calvin having a crush on Susie, and the clone disappeared as soon as it got angry enough to have an evil thought (namely, beating the snot out of Calvin).
147-->'''Hobbes:''' [[LampshadeHanging Another casualty of applied meta-physics.]]
148* In ''ComicStrip/BloomCounty'', Oliver Wendell Jones creates a math formula which explains the existence of everything everywhere...except penguins. Opus disappears, and then reappears when Oliver notices a mistake in the formula ([[CarryTheOne he forgot to carry the two]]) and rewrites it.
149** In another strip, Oliver hacks into the IRS computers and erases all data pertaining to his father, so his dad won't have to pay taxes. His father is immediately erased from existence.
150* ''ComicStrip/{{Doonesbury}}'' had two men, apparently identical twins, who were advocates for an unusual drug. In an interview, one of them says that one of its side effects was it that could "make your alter-ego visible". The other says "Wait - you're saying I'm only a side effect?" In the next panel, the first man says "the effects are only temporary," and the second has vanished.
151* The final daily ''ComicStrip/USAcres'' strip had Orson looking for it in a newspaper, realising it wasn't there, and immediately disappearing.
152[[/folder]]
153
154[[folder:Radio]]
155* ''Radio/JohnFinnemoresSouvenirProgramme:'' One sketch has Victor Hugo and Quasimodo get into an argument about ''The Hunchback of Notre Dame'', with Quasi being very offended by the title and Hugo trying to defend it as not being his choice to begin with. Eventually the argument ends (after getting ''very'' meta) when Quasimodo points out he doesn't exist, and therefore promptly ceases to be, leaving behind a confused Hugo wondering what he was doing.
156[[/folder]]
157
158[[folder:Tabletop Games]]
159* ''TabletopGame/DungeonsAndDragons'':
160** Second Edition introduced a spell called Solipsism, which can create illusory objects that behave exactly like real ones -- but only if you believe they are real. If you don't believe in it, you'll fall right through that bridge the cleric conjured. This is loosely based around the (RealLife) philosophy of UsefulNotes/{{solipsism}}, which posits that the only thing one can be sure exists is himself, and therefore one's perceptions define one's reality.
161** It also plays with this trope with the spell Shadow Conjuration. It summons quasi-illusory monsters that are as powerful as the real thing if you believe they're real, and one-fifth damage if you don't. Like all things D&D, [[GameBreaker it can be whored to ludicrous lengths]]. One prestige class specialises in shadow illusions. Layer enough "reality"-boosting effects, and you can [[MindScrew create illusions more real than reality]]. Cue humorous conversations:
162--->"I cast a shadow ''fireball''."\
163"I make a will save to disbelieve."\
164"Good. Take 150% damage."
165** 3.5E and ''TabletopGame/{{Pathfinder}}'' add Shadow Enchantment, Evocation, and Transmutation, which work similarly with spells of the respective school of magic. One of the nastiest versions is ''Pathfinder'''s Baleful Shadow Transmutation, which works by tricking the target into believing it has been [[ForcedTransformation transformed]].
166** The 3E TabletopGame/{{Ravenloft}} description of Lamordia, land of mad scientists and skeptics, describes an optional phenomenon called the "Smothering of Reason", where Lamordians' prevalent disbelief in the supernatural occasionally causes spells to fail, magical creatures to weaken, etc.
167** ''TabletopGame/TheFantasyTrip'' has a powerful Illusion spell. Illusions deal damage as though they were real, but can be dispelled by making a roll to "disbelieve", causing the illusion to vanish in a puff of logic.
168* The RPG TabletopGame/{{TORG}} had the fantasy world of Aysle, where the local laws of reality stated that YourMindMakesItReal to the extent that real people could cross a sufficiently convincing illusionary bridge.
169* ''TabletopGame/{{Planescape}}'', as a setting governed by ClapYourHandsIfYouBelieve, has numerous examples of this. There's even an entire faction, the Sign of One (or Signers) that operate on this principle. According to in-universe rumor, particularly powerful Signers can disbelieve an annoying sod right out of existence.
170* The Illusion advantage in ''TabletopGame/{{GURPS}}'' has an upgrade that allows it to cause small amounts of damage if the victim is convinced it's real. The GURPS spell Solipsism causes you to assume you're the only thing that's real and the guy swinging a sword at your head won't ''really'' hurt you.
171* Another solipsism reference, from ''TabletopGame/{{Scion}}'':
172** The Knack Solipstic Defense allows you to ignore an attack entirely by believing it isn't real - since you have Legend, an element of the divine, what you believe ''goes''. The other requirement is being unaware of the attack.
173** Aten, sole avatar of [[LightIsNotGood Akhetaten, The Titan of Light]] (Having devoured all the other avatars, who were not worthy of existing compared to his glorious self) is a version of this. He is ''so'' certain of the fact that his existence is the only one, that he is immune to any source of damage from anything. Your only hope of defeating him is to first debate him in philosophy and theology.
174* The point of ''TabletopGame/MageTheAscension'', and to a lesser extent ''TabletopGame/DemonTheFallen''.
175** You can perform amazing feats as long as you keep them believable, such as conjuring money from your wallet, or causing lightning to strike during a thunderstorm. If you strain disbelief too much, or simply don't care and go all-out, it might still work, but you have a pretty good chance of getting smacked around by the universe at large on the grounds that Magic Does Not Work That Way. This is true even if there's nobody watching.
176** The setting explains that the main antagonists, basically TheMenInBlack, came into power through a centuries-spanning EvilPlan of convincing the world at large that no, brooms can't fly, and that yes, you can heal people by injecting them with complicated chemicals. They have caused mythical creatures like unicorns to go ''extinct'' by making people stop believing them, and caused places like El Dorado to cease to exist by creating maps to prove they weren't there. Conversely, there are some areas in the world where people still cling to their old beliefs, and thus the effect is reversed. In certain secluded spots in the Middle Eastern deserts, flying carpets and genies are considered normal, whereas ''airplanes'' are considered "vulgar magic" and a violation of common sense, and stop working as a result. By now it is clear that there is absolutely no difference between Science and Magic. [[DoingInTheScientist Science is just Magic that most people believe in, and therefore everyone can use.]] The various 'Mystic' factions are trying to reverse this trend by getting people to believe in ''their'' path, whether alongside Science or instead of it.
177* ''TabletopGame/MageTheAwakening'', ''Ascension's'' reboot, does away with the ClapYourHandsIfYouBelieve angle but contains several examples:
178** A certain Abyssal manifestation that amounts to a inescapable maze can be negated just by navigating it in a such a way to prove that it must have an exit and logical connections.
179** Whenever {{Muggles}} witness obvious magic effects, their intrinsic disbelief in the supernatural will slowly unravel the spell, due to the power of the Abyss enforcing the lie that magic isn't real.
180* ''TabletopGame/{{Toon}}''. Characters are able to pull cartoon stunts such as walking on air, sawing through a branch and have it remain hanging while the tree falls away, painting a door onto a wall and opening etc as long as [[RuleOfFunny it's funny]] and they [[FailedASpotCheck fail the Smarts check]]. It is a rule of the game that these feats will work so long as the characters don't realize that they should be impossible. That's right, the dumber a character is, the more easily they can get away with violating the laws of physics and common sense. The space opera-themed chapter of the ''Tooniversal Tour Guide'' supplement mentions a planet that is so dependent on this principle that it's off limits to visitors for fear that they might bring its whole civilization crashing down by ''pointing out that it can't work''.
181* In ''TabletopGame/GeniusTheTransgression'', the inventions of [[MadScientist Geniuses]] are literally powered by their creator's madness. If these creations are scrutinized by Muggles, these devices will stop working or malfunction as the laws of physics notice that their principles were disproven years ago.
182* In ''TabletopGame/MachoWomenWithGuns'', the Batwinged Bimbos From Hell can learn the "Distort Reality" skill; when they are attacked, they can focus their attention on something else (their nails, a run in their stockings, a cloud, etc) and since they've forgotten the attack, it can't hit. It will instead target one of her allies, who might not appreciate the gesture.
183* In ''TabletopGame/{{Warhammer 40000}}'', this is the reason Tzeentch, Chaos God of Ambition, Change, and Hope (among other things), hasn't conquered the galaxy. While he is ''the'' {{Chessmaster}} of the Milky Way, he is the embodiment of a desire for change in the future. If he were to ever seriously complete any of his long-term goals in such a way that he was entirely satisfied with the outcome, he wouldn't be able to hope because his desire would be in the present. So he sets up his plans so that they sabotage each other, allowing him potential goals that he could ''theoretically'' reach but never actually will.
184* In ''TabletopGame/TalesFromTheFloatingVagabond'' one of the Shticks, the Newton Effect, allows a player character to [[LampshadeHanging point out]] something they believe should be impossible (such as magic powers or mad science) and have it stop working.
185* ''TabletopGame/ArsMagica'' 3[[superscript:rd]] Edition: "Reason" is a metaphysical power like the Divine, Infernal, Magical, and Fae Realms; this MagicVersusScience mechanic means that magic can be unraveled by the pure Reason of a laboratory or a devoted scientist. Because of how nonsensical this is in a world where magic is proven to exist through multiple branches of FantasticScience, this was dropped in later editions.
186[[/folder]]
187
188[[folder:Theater]]
189* A variant happens in Gilbert and Sullivan's ''Theatre/{{Ruddigore}}''. The Baronetcy of Ruddigore is cursed - its occupant must commit a crime every day, or die, dragged off by the ghosts of those previously killed by the curse. Then the current Baronet realises that suicide itself is a crime, and since not committing a crime is tantamount to suicide, this too counts as a crime. Therefore, none of the people killed by the curse should have died; as soon as this is realised, the former Baronets simply pop back to life, just in time to PairTheSpares with the female chorus.
190[[/folder]]
191
192[[folder:Toys]]
193* This is how most illusion powers seem to work in ''{{Toys/BIONICLE}}'' - they can fool all five of your senses, even appearing to be completely solid, but if the victim ceases to ''believe'' in the illusion, it instantly fails. This is apparently true even for different species of illusion users.
194** During the Bohrok arc, Pohatu and Onua, the two strongest Toa Mata, struggle to break a rock wall to escape before the room fills with lava. However, they're unable to make a single chip in it. Lewa realizes that there's ''nothing'' the two of them are unable to smash, which means the wall cannot possibly be real. As soon as they stop believing the wall exists, they become able to pass through it. Sure enough, the projectors of said wall, the Bahrag queens, are able to create illusions at will. Several of the Toa again end up fighting false opponents, being helped by their teammates that can see which Bahrag aren't real.
195** In ''Time Trap'', [[spoiler:Vakama realizes he's been in an illusion for most of the book - the seeming alternate reality he'd somehow fallen into was in reality a plot by the Makuta to lead him to the Mask Of Time. Vakama breaks free when he throws a kanoka disc through "Nokama's" head, revealing her to be a disguised visorak. He actually had figured that the situation wasn't real a while before that, but decided to keep playing along with the illusion to find clues.]]
196** Even after having his powers ''massively'' boosted by [[spoiler:becoming a PhysicalGod]], Makuta's illusions are still vulnerable to this - Axxon spent an indeterminate amount of time seemingly running through a vast desert chasing Brutaka's pained screams at the start of ''Reign Of Shadows'', only to realize that even Brutaka couldn't have withstood ColdBloodedTorture for ''that'' long, and that the sun never moved despite seeming like weeks had passed. He instantly wakes up from the illusion.
197[[/folder]]
198
199[[folder:Video Games]]
200* ''VideoGame/DivineDivinity'' has a funny bit where the PC comes across two [[DemBones skeleton]] {{Mooks}} having a discussion. One explains how they don't eat because they have no stomachs, which leads to the other one questioning how they can talk without vocal cords. The first one agrees and says that, thinking about it, they shouldn't even be able to hold themselves together without muscle and skin. One of them remarks that realizing the truth would be quite unpleasant and the other agrees to drop the issue. Still, the seeds have been planted and they both collapse immediately after.
201* ''VideoGame/PlanescapeTorment''. Being set in Planescape (mentioned above), ''everything'' works this way. Several notable examples include:
202** The Nameless One recovering a memory in which an earlier incarnation manages to prove to a Sign of One devotee (a sect of solipsists) that he does not actually exist... Said man then disappears, much to the delight of the crowd who has gathered to watch the debate.
203** A very charismatic and wise Nameless One can, instead of recruiting Vhailor, either convince him that his PurposeDrivenImmortality is pointless or that he's restricting himself because the number of currently dead criminals outnumber the currently living ones. Successfully convincing him of either is enough to make him (literally) give up the ghost and die.
204** If the Nameless One gives his name as 'Adahn' frequently enough, a man named Adahn appears in-game. He only exists because the Nameless One's been claiming to ''be'' him, after a fashion, and if you point out as much to him... poof.
205** At one point, the current incarnation is able to do this to [[spoiler:himself, literally ''willing'' himself out of existence]] [[StatisticallySpeaking if your WIS score is high enough]].
206* In ''VideoGame/FlightOfTheAmazonQueen'', you encounter a gorilla blocking your way. How do you get rid of it? By telling it that gorillas only live in Africa. The gorilla suddenly gains the ability to talk, mentions that his presence in the Amazon jungle makes no sense, and then vanishes into thin air. You later encounter the gorilla again, this time wearing a dinosaur costume, and get rid of him the same way.
207* In the first episode of ''VideoGame/SamAndMaxTheDevilsPlayhouse'', if Sam looks at a readout on one of Mama Bosco's computers, he will say that according to these readings he and Max shouldn't exist. At this point both characters disappear for a few seconds before coming back, with Sam remarking that he must have misread the readings.
208* In ''VideoGame/SilentHill1'', [[spoiler: Lisa Garland]] disappears in a puff of ''blood'' when she realizes that she is the same as the other monsters around her.
209* ''VideoGame/SuperScribblenauts'' allows the player to summon various deities. It also allows you to summon an atheist who upon seeing a god will immediately start displaying the "thinking" icon and run towards it, causing the god to die on contact.
210* ''VideoGame/DwarfFortress'' occasionally does this to ''itself'': Parameters to define how something exists in the world map are quite different from those used in the parts where the game is actually being played, and as soon as something from the former enters the latter, it gets subjected to reality. If this happens, best case scenario is a centuries old king dies from old age as soon as they step into your fortress, or a dwarf who lost his head years ago finally has death catch up with him. Worst case? You get a frame to watch the surrealistic scenery you embarked into before physics apply and your dwarves get swallowed by the collapsing earth.
211* ''VideoGame/TheBardsTaleTrilogy'' gives the Sorceror class the ability to summon illusions to fight with the party. These can inflict damage on the enemy, and any damaged inflicted stays inflicted no matter what subsequently happens, but if the monsters disbelieve the illusion it immediately disappears. This doesn't stop the Sorceror immediately summoning up another monster exactly like it - it seems LaserGuidedAmnesia stops enemies immediately realising this new monster is an illusion too.
212* In ''Franchise/TouhouProject'', it is heavily implied that this would be the fate of any supernatural being who nobody believes in any more, due to the setting relying heavily on ClapYourHandsIfYouBelieve. In fact, the creation of the Great Hakurei Barrier was specifically for the purpose of defying this trope, and it would likely hit all of the supernatural residents of Gensokyo in full force should the Great Hakurei Barrier fall.
213** In fact, in one the universe compendiums it's mentioned that [[PaintingTheFrostOnWindows the Yamabiko, mountain spirits responsible for shouting your echo back at you,]] are currently facing extinction due to a spreading superstition in the Human Village that echoes are actually just reflections of sound waves coming back to you.
214* ''{{VideoGame/Undertale}}'': One of the [[TheDitz Temmies]] is allergic to ''themselves''. They show no signs of this until they tell you about it, at which point they immediately break out in [[RougeAnglesOfSatin "hOIVS!"]].
215* ''VideoGame/{{Koudelka}}'' has Charlotte the ghost of a little girl who died in a fire after years of being tortured in the ruins of the Inquisitional dungeon the game takes place in, convinced hatred was all the world had to offer her. Completing a short fetch-quest prior to the final confrontation will see Koudelka in possession of the letters the Inquisitors were keeping from her, letters from Charlotte's mother explaining she gave her up to the Inquisition rather than see them kill her on the spot for [[BastardBastard "being born wrong"]] and hopes she is being treated well by the men of God even if they can never be together. Upon realizing she actually had someone who genuinely loved her, Charlotte poofs. She is not willingly moving on, the very concept of [[WhatIsThisThingYouCallLove love confuses and scares]] Charlotte, but it means the foundation of her hatred is flawed and thus she fades away with it.
216* ''{{VideoGame/Arcanum}}'': Science and magic work by exploiting and breaking laws of physics (gravity, thermodynamics, etc.) respectively, so machinery fails in the presence of strong magic and magic fails in highly industrialized environments.
217* One of ''VideoGame/{{Minecraft}}'''s rules is that you can only sleep (in a bed) at night. The Nether and End alternate dimensions don't ''have'' time, so if you try to sleep there, the bed [[StuffBlowingUp explodes]]. [[LethalJokeItem With a force stronger than TNT, and far less work to set up]].
218** Another ''Minecraft'' example: most blocks are not affected by gravity, but a few (most notably sand, gravel, and flowing water and lava) ''are''. As such, if you try to place one of these blocks in midair, it will immediately fall (or flow) down. However, the game's terrain generator is under no obligation to place these blocks on top of non-gravity-obeying blocks, meaning that newly-entered areas of the map will often (especially in desert or gravel beach biomes) generate with sand overhangs, water and lava blocks that stay tidily in their source locations and do not flow downhill, and the like. Unlike the ''Dwarf Fortress'' example above, the game does not apply gravity to these blocks until the locations corresponding to said blocks are "updated", usually by placing something on the block or breaking an adjacent block. At which point [[GravityIsAHarshMistress gravity is applied]] and the whole thing collapses onto the terrain below / the area is suddenly flooded with water or lava (when a block falls or flows due to gravity being applied, this updates the adjacent blocks, causing them to fall, and so on until there are no more unsupported gravity-obeying blocks). Notably, walking on (or swimming through, for water and lava) these blocks, riding horses on them, shooting arrows into them, etc., does ''not'' update them, meaning that it's perfectly possible to enter such an area and not notice anything wrong [[OhCrap until the player tries to place a torch for illumination / navigation and the whole area collapses into a buried cavern]]. The same thing happens if gravity-obeying blocks are placed in midair using a third-party map editor, which can be used (especially in multiplayer) to create pitfall traps.
219* This is a hazard of time travel in ''VideoGame/FateGrandOrder''. One of MissionControl's tasks is to prevent the cosmos from "correcting" your presence in eras prior to your birth, which is why they panic every time the connection lags or drops (which is often).
220* The concept of "CHIM" in ''Franchise/TheElderScrolls'' is an ascended state giving one godlike powers. The process of attaining it, however, is one that most who attempt it do not survive, as they tend to accidentally will themselves to stop existing in [[HeroicBSoD the ensuing existential crisis]] that naturally comes with [[spoiler:realizing that they're just a character in a video game, and therefore aren't real]]. If they don't panic at this and ''do'' survive this critical moment, however, they'll soon after [[spoiler:[[MediumAwareness realize that this means they have access]] to [[GameMod modding capabilities]] and [[CheatCode console commands]]]].
221* ''VideoGame/BabaIsYou'':
222** Forming a rule in the form of "X is not X" makes the affected object instantly vanish.
223** Giving the same object two mutually-destructive properties, such as Hot and Melt, Open and Shut, or You and Defeat, makes it melt/unlock/defeat itself and disappear.
224[[/folder]]
225
226[[folder:Visual Novels]]
227* Vanishing in a puff of logic is a consuming peril for the witches in ''VisualNovel/UminekoWhenTheyCry'', who are largely only as real as they can convince other people they are. Witches are therefore continually performing horrendous deeds in order to be recognised, while trying to undercut the reality of their rivals. At one point a witch uses magic to disprove her own existence, which has a result like reality DividingByZero.
228[[/folder]]
229
230[[folder:Web Animation]]
231* ''WebAnimation/BungChronicles'':
232** Most mythological deities ended up [[KilledOffForReal dying permanently]] due to [[ClapYourHandsIfYouBelieve existing by belief]] and people no longer believing in them.
233** [[spoiler:In 'Her(bivore)', this is [[InvokedTrope weaponized]] by Bung and Marina against Ares after the latter wreak havoc in the mortal world]].
234* In ''WebAnimation/EddsWorld'', the three main characters get a car and get it to fly by "using the Z-Gear of course". It goes up to very trippy music in which Edd and Tom start dancing in the car. Matt then shouts "how can a car fly?" [[LettingTheAirOutOfTheBand The music slows to a stop,]] then the car then falls down to land on top of a plane. This trope is then inverted when the pilot wonders [[SugarWiki/FunnyMoments whether his]] '''[[SugarWiki/FunnyMoments plane]]''' [[SugarWiki/FunnyMoments can fly]]. Then this continues and when the car gets there, several planes are now below them (each having doubted their flying capability).
235* In ''WebAnimation/FinalFantasyVIIMachinabridged'', this is how the [[http://finalfantasy.wikia.com/wiki/Bottomswell Bottomswell]] is defeated. During the fight, Cloud wonders about the monster's visible gills, reasoning that it should need water to live. Cue monster disintegration and Cloud's confused LampshadeHanging.
236-->'''Cloud:''' Did... did it ''[[TooDumbToLive forget]]'' that it needs water to breathe?
237* [[https://www.youtube.com/watch?v=jYM7Jgljmn0&t=3m40s In this parody of]] ''Franchise/KingdomHearts'' known as ''WebAnimation/KingdumbHearts'', Goofy asks if TheHeartless have no hearts, [[LiteralMinded how can they live.]] [[spoiler: Right after that, Maleficent, Riku, and Kairi all fall over dead]]. It happens again in the sequel when [[Franchise/PiratesOfTheCaribbean Will Turner]] manages to kill a skeleton by bringing up its lack of muscles.
238* ''WebAnimation/MinilifeTV'': In "1-800-MINIDIAL", The Armless Guy calls Chris and Ian's hotline for help after he got eaten by a cartoon whale in the previous episode "STORY TIME!". When Chris asks him how he was able to call the hotline without any arms, the call hangs up.
239* In the ''WebAnimation/{{Pantsahat}}'' episode "Indiana Jones Raided my Panty Drawer", after Indy raids [[Literature/FateApocrypha Astolfo's]] clothes, including his panties, Tahu is relieved his Timb(erland)s weren't stolen until Hippo says they're so fake they don't exist, making them disappear.
240-->'''Tahu:''' Girl, at least he didn't get my Timbs.\
241'''Hippo:''' Bruh, your shoes so fake they non-existant.\
242(the Timbs disappear off of Tahu's feet)\
243'''Tahu:''' Bring 'em back.
244* ''WebAnimation/Plan3'': When Hart appears in ''The Chinese Food Curse'' as the Chinese food delivery driver, his pop-up bio states he’s not in the episode. [[BreakingTheFourthWall Once he notices the discrepancy and starts to question it]], he gets phased out of existence.
245[[/folder]]
246
247[[folder:Webcomics]]
248* ''Webcomic/EightBitTheater''
249** [[http://www.nuklearpower.com/2005/10/11/episode-610-logic/ Red Mage tries to fight a tyrannosaur]] and claims he was born to hunt dinosaurs. The tyrannosaur says this doesn't make sense because dinosaurs are extinct. Red Mage retorts "Then explain ''yourself''," and the tyrannosaur [[OhCrap goes pop-eyed]] and [[StuffBlowingUp spontaneously combusts]].
250** It doesn't always work out for him though - Red Mage tried fighting a giant [[http://www.nuklearpower.com/2002/05/27/episode-153-ponderous-rhetoric/ much]] [[http://www.nuklearpower.com/2002/05/29/episode-154-it-was-a-nice-try-as-usual/ earlier on]] by pointing out that a creature that large could have never evolved and violates the SquareCubeLaw, and therefore the giant doesn't really exist. The giant makes some weak counter arguments, [[TalkToTheFist and then crushed Red Mage with his club]].
251--->''[[OhCrap Wait! I have another theory, you're a pacifist!]]''
252** He uses similar reasoning in a later strip to deny the existence of 'Megahedron', his supposed avatar of the gods, claiming that it is really just a figment of his own imagination. His reasoning was that, if Megahedron was a figment of Red Mage's own mind, then he'd be smart enough to be able to convince him of his existence, a task at which he had so far failed (Megahedron's own suggestion). When Red Mage conceded that point, he went on to say that since Megahedron ''had'' convinced him with that argument, then that means that Megahedron ''is'' a figment. The only problem with that (which RM is too busy ignoring Megahedron to listen to) is that by that logic, Megahedron did ''not'' convince him. So that should convince him, which should not convince him, which should and [[LogicBomb oh dear, I've gone all cross-eyed]].
253** He encounters a similar situation during his trial for class promotion. He encounters a monster who keeps outwitting him. He "defeats" it by admitting that he has failed and cannot beat it; the whole purpose of the conflict was to teach him humility. As soon as the monster leaves, however, [[IgnoredEpiphany he assumes that he subconsciously outsmarted the ordeal and learns absolutely nothing.]]
254*** This occurred immediately after the encounter with the tyrannosaur at the top; upon being told he faces the ordeal of Pride, he declares that he lacks arrogance, because that would be a '''flaw'''. He expects it to be over, here, same as last.
255** [[InvertedTrope Inverted]] in another instance. One encounter against a bone dragon has him repeatedly cast the Haste spell, hyper-accelerating the monster so fast that it begins to redshift, crumbling to dust in a matter of seconds... Until Red Mage says that Haste doesn't actually stack in intensity, only duration, and the dragon goes back to savaging the party.
256* ''Webcomic/CaptainSNES'' attempted this three times... twice in canon and once as a side-story. The first In-Canon attempt failed miserably, while the side-story one succeeded. The second time in canon, the victims did it to ''themselves'' accidentally.
257* ''Webcomic/StickmanAndCube'' did this in the early "Cube Disappears" arc, which ended up creating the comic's first recurring villain.
258* This is how Bun-bun exorcised the ghost of Creator/AynRand from Kiki in [[http://sluggy.com/daily.php?date=010121 this]] ''Webcomic/SluggyFreelance''. She didn't believe in the supernatural, obviously, so how could there be a ghost of her? The guest comic is courtesy of ''Webcomic/BrunoTheBandit'' creator Ian [=McDonald=], who ''loves'' this trope.
259* ''Webcomic/TheOrderOfTheStick''
260** [[http://www.giantitp.com/comics/oots0585.html #585]]: Vaarsuvius attempted to use his Common Sense to aid in the Banishment of an enormous devil which was in clear violation of the SquareCubeLaw. Didn't work. The fact Vaarsuvius is a magical elf who was flying with no physical means of propulsion at the time did not help the argument.
261** Another comic ([[http://www.giantitp.com/comics/oots0321.html #321]]) has the team's horses and riding dog disappear when Elan points out that they shouldn't be there. Only Durkon's pony, who had every right to be there, remained.
262* In ''Webcomic/TheNonAdventuresOfWonderella'', Wonderella beats [[http://nonadventures.com/2007/11/17/melanin-colleague-and-the-infinite-sadness/ WHITE SPACE]] this way:
263-->'''Wonderella:''' You are ''blue''.\
264'''WHITE SPACE''' Oh dear. * pop*
265* In ''Webcomic/{{PVP}}'', Scratch Fury succeeds exactly where [[Webcomic/EightBitTheater Red Mage]] failed in [[http://www.pvponline.com/2008/09/10/candles-in-the-dark/ this strip]]. He does it again, to a chimera this time, in [[http://pvponline.com/comic/carry-the-one this strip]]. This time, however, it doesn't go off until he corrects an error in his equation.
266* It occurs in [[http://smtenterprises.com/Comics/Comic90.html this]] Sverd Shelgr strip, though it's more of story mechanics than true logic.
267* ''Webcomic/ElGoonishShive'': Melissa [[http://www.egscomics.com/?date=2011-04-26#comic attempts to deny a portly dragon its ability to fly]], only to find that "'WesternAnimation/TheFlightOfDragons' rules don't apply" in her {{Verse}}.
268** Justin comes across a comic that claims that it "doesn't have a social agenda" while "bringing back good, old fashioned heroes versus villains". George notes that that sounds like a social agenda which [[https://www.egscomics.com/egsnp/assorted-18a-004 causes]] a paradox and the comic disappears in a flash of light.
269* In ''Webcomic/{{Goblins}}'', one of the alternate universe Minmaxes tries this on the Universe using some InsaneTrollLogic.
270* In ''[[Webcomic/TheAdventuresOfDrMcNinja Dr McNinja]]'', the good Doctor is knocked out at his parents' house, and his family is kidnapped. When he awakens, Doc discovers that the (cooked) turkey they were going to have for dinner is now walking around and talking. He correctly surmises that this is a hallucination brought on by his injuries and guilt over endangering his family. After he leaves to go save them, the turkey continues to move and speak for a few seconds, before realizing that it can't do so when no one is around to hallucinate it. It promptly falls over, inert.
271* [[http://amultiverse.com/2012/05/21/the-dhal-goat/ Happens here]] in ''Webcomic/ScenesFromAMultiverse''. A mystic goat said 'there is a high probably that I myself do not exist'. When a reporter asks him what would happen if that were proven true, he disappears.
272* One strip in ''Webcomic/{{Melonpool}}'' had Sam the dog writing a letter when Roberta comes by and talks with him, asking how a dog can write a letter with no thumbs. Almost instantly his handwriting becomes scribbles and he looks at her in annoyance.
273[[/folder]]
274
275[[folder:Web Original]]
276* ''WebOriginal/ProtectorsOfThePlotContinuum'' take [[BrainBleach Bleeprin]], a mixture of aspirin and bleach, to ease the pain of working with bad fanfic. The Board Constitution contains a clause which reads thus:
277-->Please refrain from reminding the agents that this is chemically impossible. They already know that, and they don't care. However, if you remind them of this, it may stop working. Then they would have to kill you.
278* WebVideo/FiveSecondFilms gives us an example in the form of [[http://5secondfilms.com/watch/you_got_mail/ a mailman working on the wrong day.]]
279* Creator/TomSka's sketch "[[https://www.youtube.com/watch?v=NPum07dH_mw I Don't Know]]" has characters who each lose a certain skill as soon as they need to use it, or someone asks if (or states that) they don’t have it. The most direct example is near the end:
280-->'''Big Jimmy:''' You little rat! You think you’re gettin’ away with this, huh? Do you even know who I am? Do you have any idea?\
281'''Agent:''' Do ''you?''\
282'''Big Jimmy:''' Wh— No... ''(disappears in a puff of existential crisis)''
283* In the ''Website/CollegeHumor'' spoof "[[https://www.youtube.com/watch?v=eaADQTeZRCY&feature=relmfu Professor]] Website/{{Wikipedia}}", a student asks Professor Wikipedia to tell everyone his knowledge about her. Another student points out that she's "not notable" even though she edits the yearbook, and she vanishes into nothing while screaming.
284* ''WebOriginal/ProtectorsOfThePlotContinuum'': One mission involves Agent Whitney encountering a Mary Sue in the middle of having sex with [[ElementalEmbodiment a monster that's made out of fire]]. Once Whitney reminds the Sue exactly what she's doing, she ignites on the spot.
285-->'''Whitney:''' (W)hen I pointed out that she was basically fucking a guy made of ''fire'', she screamed and burst into flames.
286* ''Website/SCPFoundation'':
287** The [[FridgeHorror horror]] behind [[Website/SCPFoundation SCP-]][[http://www.scp-wiki.net/scp-946 946]] is that it can do this - potentially [[spoiler: on a massive scale]], like [[spoiler: changing the laws of physics]].
288** [[https://scp-wiki.wikidot.com/scp-3088 SCP-3088]] (a phenomenon where a small town's laws became more like laws of physics) was neutralized when the town's KnightTemplar mayor passed a law (that the MTF team the Foundation sent to investigate the anomaly were to be expelled from town for being troublemakers and trying to get him voted out) that directly contradicted a previous law (that no one in the town could leave). The paradox resulted in the entire town and its people (except for the mayor's house) vanishing off the face of the Earth.
289* In ''WebVideo/HellsingUltimateAbridged'', Alucard is defeated in a similar manner as in the original series, but for a different reason. [[spoiler:In the original story, Schrödinger needed to be able to perceive himself to exist, and suffering a LossOfIdentity in the millions of souls bound to Alucard robbed him of that. In ''Abridged'', he is only everywhere and nowhere when others ''can't'' perceive him. If someone truly comprehended Schrödinger's existence, it would ''have'' to settle on "here" or "not here". By consuming Schrödinger's essence, Alucard fully observed Schrödinger, and as the proverbial coinflip went, he ceased to exist.]]
290* At the end of the ''WebVideo/ScottTheWoz'' episode "Shovelware Variety Hour: Round Three", Scott declares that whoever contributed to the Wii's shovelware problems by buying these obviously terrible games "should disappear." He then pops out of existence.
291* ''Website/NobodyHere'': In "[[https://nobodyhere.com/justme/dodo.here Dodo]]", Jogchem states that he would like to [[ReincarnatedAsANonHumanoid reincarnate as a dodo]], upon where he'll keel over and die when someone points out that dodos are extinct.
292* [[LampshadeHanging Lampshaded]] in a conversation between {{WebVideo/Technoblade}} and Ranboo. Techno asks Ranboo if the fact that he's an enderman in-universe causes any irritation to him, since they're on a grand underwater expedition. After Ranboo states that he's fine, Techno jokes that he had expected Ranboo to freak out and immediately run to the shore upon realizing he wasn't supposed to be in water.
293[[/folder]]
294
295[[folder:Western Animation]]
296* ''WesternAnimation/SpongeBobSquarePants'':
297** In "[[Recap/SpongeBobSquarePantsS2E7PrehibernationWeekLifeOfCrime Life of Crime]]", when [=SpongeBob=] and Patrick are keeping warm with a fire, Patrick questions how they have a fire when they're underwater, and it immediately goes out. [[BrickJoke Later on]], it [[PercussiveMaintenance lights up again when Patrick kicks the tinder.]]
298** "[[Recap/SpongeBobSquarePantsS3E16BornAgainKrabsIHadAnAccident I Had An Accident]]" has a different way of something disappearing. When Patrick and Sandy are attacked by a gorilla (played by [[RogerRabbitEffect a live-action guy in a gorilla costume]]), [=SpongeBob=] attempts to save them but gets torn in half. He does have one question about this whole situation: "What's a gorilla doing underwater in the first place?" [[OhCrap The surprised gorilla]] [[SuddenlySpeaking awkwardly tries to explain before yelling "George, they're on to us!"]] A [[PantomimeAnimal pantomime horse]] shows up and says "[[ScrewThisImOuttaHere Let's get out of here!]]" and they end up RidingIntoTheSunset as the protagonists watch, [[GainaxEnding along with a live-action family that was watching the episode before the father turns off their TV in confusion and disgust.]]
299** In "[[Recap/SpongeBobSquarePantsS8E13 House Sittin' For Sandy]]", [=SpongeBob=] watches over Sandy's treedome, and spends a considerable amount of time in it without a helmet. When Patrick shows up, [=SpongeBob=] inquires about the helmet he's wearing, and Patrick [[ReminderOfImpossibility reminds him that they can't breathe in Sandy's treedome because it's full of air]]. Upon realizing that, [=SpongeBob=] immediate becomes dehydrated and needs Patrick to put a helmet on him.
300* An episode of ''WesternAnimation/{{Histeria}}'' has the kids annoying René Descartes ("I Think, Therefore I Am") so much that he [[FourTermsFallacy can't think]]. As soon as he realizes this, ''poof!''[[note]]For those not in the know, his famous statement refers to the fact that he is ''capable'' of thought, in general, and thus he -- or at least his mind -- must exist in some form because the thoughts must be originating from something. [[RuleOfFunny But of course that's not as funny as a person spontaneously poofing out of existence.]][[/note]]
301* ''WesternAnimation/TheSimpsons'':
302** In the ''Itchy & Scratchy Show'' skit "My Bloody Valentine", Itchy gives Scratchy a "valentine" by ripping out Scratchy's heart and handing it to him. It doesn't seem to bother him at all until he gets home and sees a newspaper headline reading "YOU NEED YOUR HEART TO LIVE." He promptly drops dead.
303** Abe Simpson goes backstage during a theatre show in Branson featuring various celebrities commonly thought to be either dead or washed-up singing about how they are neither. He's shocked when he sees one of them:
304--->'''Abe:''' Tennessee Ernie Ford? Now I know ''you're'' dead.\
305'''Tennessee:''' No, you just ''think'' I'm dead!\
306'''Abe:''' No, you're dead. I was your biggest fan. Look, I clipped your obituary. ''[takes it out and shows him]''\
307''[Tennessee takes one look at the obituary, then gasps and turns to dust]''
308* ''WesternAnimation/{{Chowder}}''.
309** Truffles shows up in one episode after being absent, asking if this is any of her business. Chowder replies "No. You're not in this episode." and she vanishes.
310** Chowder becomes so smart that he realizes that he is in fact in a cartoon. The show is promptly 'canceled'.
311* ''WesternAnimation/PhineasAndFerb''
312** "Phineas and Ferb's Quantum Boogaloo": Older Candace is spying on Young Phineas and Ferb in a tree. When she remembers it's a holographic tree she immediately falls through it. Later, the BadFuture version of Candace disappears after Phineas points out she'd be gone after the two Candaces undid that future.
313** Done again in "Sleepwalk Surprise" when Doofenshmirtz see his dream demon while awake. When asked about it, the demon disappears.
314* ''WesternAnimation/ThePowerpuffGirls1998'': In the musical episode "See Me, Feel Me, Gnomey", a gnome takes the Girls' powers to take the evil out of the city. Later, they regained them after learning that the gnome was feeding off the wants of the people to thank him from that point on and forcing them to worship him. They fought him later, winning by singing about how everything needs its opposites and chasing him off the edge of a giant vine. He then went into a non-singing speech saying "As I descend to the Earth, and I view the universe above me, I realize that life revolves, evolves... and dissolves, completely around the opposites. Therefore, I conclude... that I cannot... exist, in my Utopian... mind." When he hit the ground, all the lines became white and the colors became black, and he exploded.
315* ''WesternAnimation/ElTigre'': In "A Fistful of Nickels", Frida defeats a skeleton reanimated by Sartana of the Dead by pointing out there was nothing holding it up, causing it to collapse.
316* ''WesternAnimation/{{Futurama}}''
317** Bender attempts to invoke this with the Robot Santa. "Come on, everybody! He can't hurt us if we don't believe in him!" It doesn't work.
318** Bender is on the receiving end of this in "Crimes of the Hot", after the crew is incapacitated by a cloud of toxic chlorine gas:
319---> '''Bender:''' Hahahaha, lightweights -- [[OhCrap Oh wait]], chlorine! (''instantly rusts, then falls over'')
320* In the ''[[WesternAnimation/SecretSquirrel Super Secret Secret Squirrel]]'' episode "Quark", a sub-microscopic supervillain named Quark plans to flatten North America by "pulling out the bottom atom" of everything to make it all collapse, to make room for his own amphitheater (Canada) and a parking lot for it (the US). Secret Squirrel shrinks to subatomic size and lures him onto a dictionary, then points out the dictionary defines a quark as "[[ScienceMarchesOn a hypothetical subatomic particle]]". Secret manages to make the villain doubt his own existence enough that he vanishes into thin air.
321* Invoked in a ''WesternAnimation/FoghornLeghorn'' cartoon where he was playing hide and seek with the nerdy little male chick. Foghorn hid in a shed, the chick scrawled some equations on a piece of paper and then found Foghorn in a different location. Foghorn goes crazy, pointing out that he was hiding in the shed, at which point the chick shows him the equations and Foghorn is forced to admit that "figures don't lie". Foghorn and the chick walk over to the shed, and Foghorn stops as he is reaching to open the door, saying "No, I better not look; I just ''might'' be in there".
322* In ''WesternAnimation/BatmanTheBraveAndTheBold'', [[spoiler: Batmite succeeds in getting the show cancelled for a darker one, but ComicBook/AmbushBug points out that the mite is too silly a character for such a dark show, resulting in Mite being erased from existence.]]
323* In ''WesternAnimation/ChipNDaleRescueRangers'', Foxglove is victim to this in her only episode. She arrives to save Dale from falling. Dale didn't know bats like her can carry anything/anyone his size. She ends up remembering this before they start falling into a trash dumpster.
324-->'''Dale''': I didn't know bats could do this.\
325'''Foxglove''': Do what?\
326'''Dale''': Fly when they're carrying so much weight.\
327'''Foxglove''': Uh oh!\
328'''Dale''': What?\
329'''Foxglove''': We ''can't''!\
330'''Dale''': Oh...
331** Her being oblivious to this trope was crucial in foiling her former master Winifred's plans.
332*** At the end of the episode, Dale carries Chip while using makeshift wings. Foxglove reminds him of the logic of carrying anyone their size and falling ensues.
333* ''WesternAnimation/SouthPark'' has an episode (involving a [[DontAsk Tooth Mafia]]) where Kyle began questioning the existence of everything after having learned that the Tooth Fairy is not real. Near the climax, Kyle began questioning if he would cease to exist if he didn't keep thinking about his existence, and then promptly vanishes into thin air because he stopped thinking about his existence. [[StatusQuoIsGod He got better]].
334* The ''WesternAnimation/DangerMouse'' episode "Once Upon a Timeslip" has DM and Penfold in the Mk. III motorcar having been transported to medieval England through a microphone quirk and the show's announcer. When Penfold brings up the fact that there were no cars in the Middle Ages, the Mk. III suddenly vanishes, leaving our heroes to plummet to the ground.
335* {{Lampshade|Hanging}}d in an episode of ''WesternAnimation/GarfieldAndFriends'', during a ''U.S. Acres'' segment. Orson points out that, [[ThisIsReality in the real world]], if you stepped off a cliff, you'd fall into the chasm the exact moment your feet stepped into thin air - whereas, in a cartoon, if you do the same thing, [[GravityIsAHarshMistress "you don't fall until you realize you're falling".]]
336* Similarly, in the ''WesternAnimation/{{Arthur}}'' episode "To Beat Or Not To Beat", Francine [[ItMakesSenseInContext puts on a football helmet, flaps her arms, and flies in the air.]] And then...
337-->'''Arthur:''' Francine, stop it! You're going to get hurt! ''Kids can't fly!''\
338'''Francine:''' They can't?\
339'''Arthur:''' No! It's impossible!\
340'''Francine:''' Oh. ''(screams and falls into a pile of leaves)''\
341'''Arthur:''' Don't you hate it when you have to burst someone's bubble?
342* Like the above two, a Powdered Toast Man bumper from ''WesternAnimation/TheRenAndStimpyShow'' has two children flying after eating powdered toast. PTM then flies past them and tells that they children can't fly, after which they start plummeting down.
343-->'''Powdered Toast Man''': It may have Vitamin F, but Powdered Toast ''sure'' doesn't make kids any smarter!
344* In a ''WesternAnimation/RobotChicken'' sketch parodying ''WesternAnimation/BackAtTheBarnyard'', Bessie points out [[AnimalGenderBender the inaccuracy of Otis, a male cow, having an udder]], which he counters with other inaccuracies such as that Abby can't have blonde hair and that cows can't walk on two legs ("Our knees should ''explode'' under this much weight!"). As soon as he says this, all three cows' knees give out and they lie on the ground in pain.
345-->'''Otis:''' Fantasy looks pretty good now, huh, you judgmental bitches!
346** In the skit which shows the consequences of WesternAnimation/{{Pinocchio}} becoming a real boy, Pinocchio is told by Geppetto his catheter infected him with Staphylococcus and he's been a boy for 1 day only. And ''that's'' when he starts to die from his Staph infection.
347** Another sketch has Wrestling/JunkyardDog trying to intimidate a couple of boys, only for them to point out he's been dead since 1998, which leaves him disappointed and sent off to heaven.
348* In ''WesternAnimation/TheAmazingWorldOfGumball'' episode "The Countdown," a bunch of Gumballs and Darwins end up time traveling to the prehistoric age. The most recently arrived Gumball and Darwin come in to watch the others fight. When the fighting changes history, Gumball and Darwin travel back and tell their duplicates that they shouldn't exist because it would create a time paradox. The others go "Oh yeah" and promptly vanish.
349* A bumper on ''WesternAnimation/TheBeatles'' has Ringo flapping his arms and flying. When John comments that it's impossible, Ringo suddenly plummets and lands on his head.
350-->'''Ringo:''' (''to John'') You and your education.
351* Subverted in the ''WesternAnimation/LooneyTunes'' cartoon "A Coy Decoy", Daffy Duck falls for a wind-up female decoy duck. At the end, Daffy is snuggling up to the decoy. [[BreakingTheFourthWall Porky comments to us]] that nothing could possibly come of this relationship, with Daffy responding with a "Hmph!," swimming off with the decoy and four wind-up baby decoys in tow. The fourth decoy stops and razzes Porky with "You and your education!"
352* In one episode of ''WesternAnimation/{{Cro}}'', the modern day storyline is Dr. C and Mike are trapped on a raft in the middle of a saltwater tank by a voracious school of [[PiranhaProblem piranha]]. At the end of the episode, [[IntellectualAnimal Phil]] saves them by getting a biology book and pointing out to the piranha that they are, in fact, freshwater fish. Realizing this, the piranha promptly go belly-up.
353* Weaponized in the ''WesternAnimation/TeenTitansGo'' episode "Knowledge" when the Titans [[FantasticVoyagePlot pilot a submarine into Starfire's body]] to reverse her newfound intelligence before [[MyBrainIsBig her swollen brain]] [[YourHeadAsplode makes her head explode]]. They battle Starfire's newly-sentient brain, who repels the submarine's missiles by pointing out that most missiles never reach their intended target and renders its lasers ineffective by pointing out that modern lasers aren't advanced enough to be used as conventional weaponry (despite this being a superhero cartoon where laser weapons have been repeatedly shown to exist).
354* ''WesternAnimation/DextersLaboratory'': In "Dexter's Wacky Races", Dexter's Dad shows off the modifications he made to his car to make it go faster, including partially dismantling it. A variation in that reality kicks in before it's pointed out.
355-->'''Dad:''' And most important, I removed all extra weight from the vehicle, including...\
356''(the car slows to a stop)''\
357'''Mom:''' ''The gas tank?''\
358'''Dad:''' ...Right.
359* ''WesternAnimation/DuckTales2017'': In the episode "A Nightmare On Killmotor Hill!", a unicorn from Webby's dream was left alone. When he questioned how he can still exist without anyone around to dream him into existence, he instantly disappears, without any sound or visual effects accompanying his sudden nonexistence.
360-->'''Unicorn:''' Wait, if nobody is around to dream me into existence, don't I-''[disappears]''
361* ''WesternAnimation/TheTwistedTalesOfFelixTheCat'': In "Comic Calamities", Felix successfully saves a first edition of one of his 1929 comic books vacuum sealed inside a bag from the VillainOfTheWeek. It unfortunately turns to dust as soon as the bag is opened by accident. As Felix cries bitterly over this, his friend Roscoe quips "And to think you're older than it". Felix goes "[[FlatWhat what]]" and turns to dust as well.
362* ''WesternAnimation/ThePatrickStarShow'': In "[[Recap/ThePatrickStarShowS2E5MovieStarsDrSmartScience Dr. Smart Science]]", Patrick goes into space. Once Sandy tells him there's no water in space, he shrivels up.
363* An episode of ''WesternAnimation/{{Histeria}}'' has the kids annoying Rene Descartes so much he cries out that he can't think. The second he realizes this, he disappears.
364[[/folder]]
365
366[[folder:Real Life]]
367* Frequently occurs in dreams when the dreamer becomes semi-lucid and realizes something that's happening in the dream is impossible, such as talking to a person who is dead in real life and suddenly becoming aware of that fact, at which point the "person" will often disappear or the dreamer will wake up.
368* A type of mental health therapy works on this basis: in "logic-based therapy" a patient is taught to recognize the illogic of the thought patterns that lead to depression, anxiety or phobia, thereby eliminating the problem.
369[[/folder]]

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