->''"What is wrong with you nerds?! Why do you have to nitpick everything?! If the premise of my situation is that I'm trapped, then I'm trapped! If you know what the definition of "trapped" is, then ''logically'' you can infer that something is keeping me here!"''
-->-- '''Mickey the Dick, when asked by multiple fans why he doesn't simply leave the show, WebAnimation/{{Wacky Game Jokez 4 Kidz}}'''

''For any given story, there exist basic elements that, no matter how improbable or impossible their occurrence, are required for the story itself to happen. Or there would be no story. In other words, there is no "resolution" without "conflict".''

[[http://en.wikipedia.org/wiki/Anthropic_principle The original Anthropic Principle]] is the observation that it is impossible for any intelligent observer to be in a universe where the conditions for intelligent life do not exist, because for the intelligent observer to exist, the conditions necessary for intelligent life must exist. Thus, it is impossible to draw any conclusions about the abstract probability of being in a universe where it is possible for intelligent life to arise from our own universe because by definition our universe must be capable of supporting intelligent life in order for us to make that observation, no matter how likely—or unlikely—that may be.

The Anthropic Principle as it applies to fiction is similar: Every [[TheVerse fictional universe]] has fundamental, '''axiomatic''' elements without which its story simply ''could not exist'', and the reader must accept those elements in order to enjoy the work. The ultimate expression of this trope is MinovskyPhysics—these elements are actually carefully planned in advance, ensuring a logical transition from real life to the fictional universe.

For example, the whole premise of ''Film/SlumdogMillionaire'' is about a character able to get on a TV quiz show and do surprisingly well, to the point that the show itself becomes SeriousBusiness. For ''Series/{{House}}'' to happen, Dr. Gregory House must be able to keep his job as a genius diagnostician despite being a major {{Jerkass}} with a drug problem.[[note]]At least one of which could get you fired in real life, depending on your job.[[/note]] You can't have ''Film/SnakesOnAPlane'' without somebody smuggling live snakes [[ExactlyWhatItSaysOnTheTin onto a plane]] somehow. It's easy to argue that the Eagles could have just flown the [[Literature/LordOfTheRings Fellowship to Mount Doom]]; Tolkien himself immediately applied the Anthropic principle before bothering to offer any in-universe suggestions as to why they couldn't.

The list goes on—for a ''Anime/MazingerZ'' or ''Franchise/{{Gundam}}'' series to happen, giant {{mecha}} must be possible to build, power, and pilot. And you cannot (to the frustration of many physicists and to the inspiration of many others) have a SpaceOpera without FasterThanLightTravel... and the resultant {{Cool Starship}}s [[WeWillUseManualLaborInTheFuture must have people on them]] (even if it's just because [[AIIsACrapshoot suitable machines can't be trusted]]) because [[MostWritersAreHuman it's hard to tell entertaining stories about unmanned probes.]] For an AdventureGame or {{RPG}} to happen, there must be ''someone'' whom the player can guide through the SortingAlgorithmOfVillainThreat and eventually beat up the BigBad. And in all of the above cases, if Adventures of those types can be had regularly, it is an AdventureFriendlyWorld.

When it comes to seeking out enjoyment in fictional works, the MST3KMantra and the Anthropic Principle are [[OppositeTropes diametrically opposed philosophies]]: The former says that some details don't need to make sense because they ultimately don't matter, while the latter says that certain details of the story '''do''' matter because they are the foundation of the story itself, and [[WillingSuspensionOfDisbelief accepting those details on faith]] is critical to the audience's enjoyment of the show even if it doesn't make much sense from an outside viewpoint.

* This trope is surprisingly often [[DefiedTrope defied]] by novice critics reviewing ComicBook [[TheMovie film adaptations]] and {{Fantasy}}, when they [[SciFiGhetto dismiss an entire genre]] in its opening paragraph by pointing out that the very premise of the story is realistically impossible and rests upon [[CharacterArchetype childlike simplifications]]—and anyone who takes such stories seriously must by definition be irresponsible and childish themselves; see Administrivia/ComplainingAboutShowsYouDontLike and BiasSteamroller.
* Conversely, the need for the plot to work ''as an actual story'' is a problem for [[FanDumb overzealous fans]] who attempt to [[FanWank explain away]] an aspect of the story that requires BroadStrokes. They may forswear any [[DeathOfTheAuthor literary]], character-driven, or [[EpilepticTrees other]] interpretations, placing [[AllThereInTheManual rigorous consistency]] above all whether or not it makes [[RuleOfDrama a good story]]; and apply [[ArmedWithCanon similar standards]] when judging film adaptations, even when there'd be no film if their proposed changes were made.
* Sometimes the author is dissatisfied and rebels against the underlying premise. Changes to the basic premise to make it "consistent" or "relevant" (due to CerebusSyndrome or ExecutiveMeddling) will require a ContinuityReboot or a total {{Retool}} of the premise. Compare TheyWastedAPerfectlyGoodPlot.

This is why {{FanFic Header}}s need to issue warnings about AlternateUniverseFic, and why TransplantedCharacterFic is despised by many FanFic readers.

Many RealLife theories about the Anthropic Principle rely on notions of TheMultiverse and probable alternate universes (which do not need to [[MindScrew actually exist]] to be considered alternate universes, since it makes little practical difference to our universe and us in it.) Such theories excite the DaydreamBeliever. Not to be confused with {{Transfictionality}}, where the author creates his own AlternateUniverse by imagining the story.

This scenario is actually the one currently favored by a lot of physicists, since String Theory (apparently) requires the existence of something like 10[[superscript:500]] different sets of physical laws[[note]]On the other hand, the predictions of most cosmic inflation models are: either a mind-boggingly vast (or even infinite) universe, where as there's a limited number of ways to reshuffle atoms things will repeat again and again even ''ad infinitum'' - with the same laws of physics everywhere-, or that plus countless other universes each one of them with their own physical laws, number of dimensions, etc. This without including the "many-worlds" interpretation of quantum mechanics.[[/note]]. A similar argument explains why we find ourselves born onto the relatively congenial surface of a planet, rather than inside a star or deep space. (Looked at that way, it starts to seem less like rocket science and more like "and?")

In a sense, it can often be assumed that the events portrayed, however unlikely, are still occurring within the realm of conceivable probability. For example, if a plot initiates because a character experiences an incredible event; even if the probability of said event was relatively unlikely, it can be assumed that the character also experiences many completely mundane events where nothing extraordinary happens, and that this event was simply the reason that the episode has been shown to viewers. (a.k.a. ConservationOfDetail.) In short, the events portrayed are not chosen at random from an arbitrary sampling of all existing events (nor even the characters, locations, etc), they are simply the events which are deemed to be of interest. Unlikely events do happen in real life, just not ''all the time''. '''Improbable does not mean Impossible'''. If someone were to select only the most interesting events that happened to the most interesting people, and write only about them, then even regular human life may seem extraordinary to the reader. It does not make those events any less believable.

In this way, it could even be reasoned that Truly Fantastical stories are conceivable within the defined universe. For example, Superheroes may ''seem'' to be continuously rescuing those in distress and foiling evil schemes, however these may very well '''not''' be everyday occurrences; they may even conceivably happen weeks apart, with simply nothing of interest occurring in between, and thus those events are the only ones the readers are told about. After all, who would be interested in seeing Franchise/{{Superman}} [[http://de.toonpool.com/cartoons/Superman_4718 taking a leak?]]

Compare RuleOfDrama, ChandlersLaw, DramaPreservingHandicap, NecessaryWeasel, AcceptableBreaksFromReality, AdventureFriendlyWorld. TheLawOfConservationOfDetail serves as the [[WatsonianVersusDoylist "Doylist" counterpart to this trope's "Watsonian" perspective]]. Inverse of MST3KMantra. The OriginalPositionFallacy is a related trope where characters in-story assume they're far more important than they really are.

!! This will be for shows, games, ''etc.'' where the Principle is [[LampShading mentioned]], [[InvokedTrope invoked]], or demonstrated particularly well.


* In a strip of ''ComicStrip/CalvinAndHobbes'', Calvin notices that his existence depends on everything that came before him, and deduces that the ultimate purpose of history must be to produce [[ItsAllAboutMe himself]]. Armed with this grandiose and self-affirming philosophy, he goes and watches TV.
* In ''[[{{ComicBook/Marvel1602}} Marvel 1602]]'', Reeds speculates on the Anthropic Principle, theorizing that the Thing can never become human again because he's more interesting this way.

* HigurashiNoNakuKoroNi: Keiichi had a discussion about mysteries with his mother who pointed out that without a dead body, there is no mystery to kick off the story. This inspires him to commit a murder [[note]]to save someone[[/note]] and hide the body before it's discovered. Unfortunately, this bites him in the ass later as he's unsure if he actually did commit the murder as he couldn't find the body.

* The ''Film/DayOfTheDead2008'' remake illustrates an example common to many zombie films. It is explained that the zombie virus can be transmitted by air in addition to being bitten by a zombie. When one character asks why all the [[ContractualImmortality main characters are uninfected]], the scientist explains that "some people are just immune to the airborne aspect." Although it may seem like [[DeusExMachina an incredible and unexpected coincidence]], they would necessarily have to be immune to be main characters.
* ''{{Film/Next}}'''s Cris Johnson ''literally'' lives by means of this trope; he can see up to two minutes into the future at any given time, and in certain situations even further. It's as natural to him as seeing lightning before hearing thunder is to most people, and he can actually dodge ''an entire magazine of machine gun bullets'' in this manner, visualizing his alternates dropping dead in his wake.
* ''Film/PacificRim'': the unlikely scenario that HumongousMecha are the most effective and practical defense against {{Kaiju}} is required to make a movie based completely on the concept of Humongous Mecha fighting Kaiju.
* In ''Film/FantasticBeastsAndWhereToFindThem'', Newt Scamander's magical briefcase (which holds every animal he's collected) ''keeps popping open'', releasing various monsters into the city.

* Given a ShoutOut in one ''TabletopGame/BattleTech'' novel, where it's revealed that [[spoiler:Vladimir Ward]] firmly believes in a personal version of this—that is, he's earnestly convinced that the Star League fell and the Clans came into being just so that ''he'' could be born at just the right time for the invasion and go on to conquer the Inner Sphere. To him, that's actually the simplest and most logical explanation for everything in his life up to that point.
* The Literature/{{Discworld}} series have this as a major theme in general: Discworld is a world of stories. The world often conspires to get the people in the stories to play their roles, no matter what the consequences. The people often aren't happy with this. One book mentions the Unseen University Professor of Anthropics, who has created the Extreme Anthropic Principle: the theory that the universe is here solely for the Unseen University Professor of Anthropics. It is further mentioned that everyone, with a few changes of the Insert Name Here variety, secretly believes the same thing.
** Some of the "About the Author" blurbs state that Creator/TerryPratchett writes the ''Discworld'' books in accordance with the Very Strong Anthropic Principle, which states that the universe we live in is the way it is so that it is a universe that can support the existence of a guy who writes ''Discworld'' books.
** And, in a very meta twist, characters on the Discworld who are well-versed in those stories can predict the future and act with imperfect knowledge because they know the Discworld will ensure that events unfold according to the story. More of a mythropic principle.
* The Finnish YoungAdult novel ''James Bondén ja kuuhullut'' (roughly "James Bondén and the Lunatics") by Kaarina Helakisa has an odd and complicated relationship with this trope in one scene. Given the situation the plot is at, for it to advance to one of its major points, two characters have to happen to type the same semi-random thing on their new Moonmad consoles, activating their special power. When they do, the improbability of it is {{lampshaded}}, but it's HandWaved with an analogy that is incorrect for anthropic reasons—well, this may have been unlikely, but so is the fact that, out of all the possible children your parents could have had, they had you. (But, anthropic principle, of course assuming they were going to have ''some'' child, all options of "who" it was going were equally unlikely but they added up to 100%, whereas most random typings wouldn't activate the special power.) As for whether this trope applies in the straightforward sense,[[note]]remember the examples for this trope aren't selected based on that but whether they interestingly demonstrate it,[[/note]] well... it does to the amazing VirtualReality powers of the console existing, but the author could have avoided the ContrivedCoincidence in activating them by changing small plot details.
* A common joke in China is wondering why Sun Wukung from ''Literature/JourneyToTheWest'' (a demi-god who can jump over continents in one bound and carry half a mountain on his back) can't just carry Xuanzang straight to India.
* This is such a fundamental and OmnipresentTrope that it even appears in something as barebones as ''Literature/AMillionRandomDigitsWithOneHundredThousandNormalDeviates''. I mean really, what are the odds of these one million digits appearing in this order on these specific pages? The whole thing is highly improbable, but hey, it needed to happen, or else we wouldn't have the million random digits with 100,000 normal deviates needed to make this book.
* ''Literature/TheSilmarillion'' is a DarkFantasy CreationMyth that goes continuously FromBadToWorse and is pretty close to being both a ShaggyDogStory and [[ShootTheShaggyDog shooting that dog]]. Then why bother writing it, let alone read it? Because there are wonderful and [[AWorldHalfFull great things amid all the desolation]]. Author Creator/JRRTolkien would probably argue that the beautiful is made even more beautiful and valuable precisely because it doesn't last.
* Creator/SMStirling's Emberverse series features a couple of main characters musing about their own luck in surviving (and thriving after) the Change. Of course, if they hadn't survived, they wouldn't be the main characters and we'd be reading about people who ''had'' instead!

[[folder:Live-Action TV]]
* ''Series/HowIMetYourMother'' has the narrator (Creator/BobSaget as, presumably, an older Ted) telling the long and convoluted story to his kids on… how he met their mother. Therefore, sometime during the series, Ted will, presumably, meet the kids' mother.
** Over the course of the series, a few other rigidly defined rules get put in to place by Future!Ted: for instance, Robin is definitely not the mother, as he refers to her as "Aunt Robin", and it's a common way of providing a plot twist when Future!Ted refers to individuals in the contemporary story in the present tense.
* ''Series/JaneTheVirgin'' is about Jane… a virgin. Thereby, she cannot have sex, and the plot sometimes has to take dramatic action to stop her. Examples include someone pulling a fire alarm, and someone [[spoiler:shooting her husband on their wedding night]].

* ''Theatre/KingLear'' has been criticized for the implausibility of a king dividing up his kingdom among his children without any contingency plan for the maintenance of his own status. That, however, is the necessary precondition for the story to occur at all.

[[folder:Video Games]]
* ''VideoGame/AceCombat'' created its entire alternate universe, [[LikeRealityUnlessNoted Strangereal]] for this very reason. The two defining factors are that nuclear weapons were completely prohibited and that the landmasses and geography make it perfect for the large-scale conflicts the series is famous for.
* ''VideoGame/AssassinsCreedI'' uses this to do away with a traditional video game trope. The plot of the game involves a man reliving the memories of an assassin ancestor using a special machine that reads genetic memories; what would be a LifeMeter in most games is called a Synchronization Meter, explaining how in synch he is with the historical events. Performing actions that are badly out of character (like killing innocents) or just plain inaccurate (like dying) lower the Synch Meter. Incidentally, it was made by the same team as the ''Prince of Persia'' series, mentioned later. Logically, this implies that Altair was an ''incredible badass'', since being hurt at all lowers synchronization- thus he never got hurt. In turn, we also know that Altair and Ezio must at some point have children, since they eventually become Desmond's ancestors. So when we meet Sofia in ''Assassin's Creed Revelations'', it is even more obvious than usual that she is the Love interest.
* If you fall off the level early in ''VideoGame/{{Bastion}}'', the narrator says, "And then he fell to his death... I'm just foolin'." You magically reappear as if you never fell; you haven't met the narrator yet, so dying isn't an option.
* ''VideoGame/BioShock1''. Near the end of the game, it is revealed that every action the hero has taken [[spoiler: was the result of post-hypnotic suggestion compelling him to act]]. If you attempt to defy the [[spoiler: mind control]] earlier in the game, [[ButThouMust not only do you not progress]], but you never even get to the point where you can discover the true reasons behind your actions. Of course, if this happens, the plot stalls. There is only an interesting game in the first place because the plot proceeded the way it was meant to—you are playing it only because it happened that way.
** Really, any video game plot where the player is [[spoiler:used as an UnwittingPawn]] works on the same principles, whether consciously or not. If Batman doesn't rescue Quincy Sharp from the Joker in ''VideoGame/BatmanArkhamAsylum'', Sharp never becomes part of the BigBadEnsemble in the sequel, and thus the entire plot of the sequel never occurs. If Snake never [[spoiler:uses the PAL key]] in ''VideoGame/MetalGearSolid'', the terrorists never gain access to Metal Gear. But because the game presents no way to progress without triggering these events, the player must continue according to plan or stop advancing the plot entirely. You can even get a GameOver for failing to save someone when it's revealed later (perhaps even hinted beforehand) that not saving them would have saved a lot of trouble.
* ''VideoGame/CryOfFear'': The whole story turns out to [[spoiler: have been written by Simon as a form of therapy after the car crash in the opening cutscene. If he had not lost his ability to walk in the crash, he wouldn't have had suicidal thoughts, wouldn't have needed therapy, and the story would never be written in the first place. This is demonstrated effectively in the alternate "Co-op" and "Doctor" modes; the playable police officers get sucked into the book (now transformed into some kind of grief spawned EldritchAbomination), and the only way for them to get out alive is to go from the end to the beginning and prevent the accident from ever happening. Dr Purnell however, enters Simon's mind willingly to destroy the book.]]
* In the ''VideoGame/ChzoMythos'', as the game "Trilby's Notes" is a recollection of the main character, it only makes sense that he must survive to write them. Should he die at any time during the game, the game mentions how the notes "mysteriously end" at that point, and perhaps were not actually written by the protagonist.
** Similarly, ''Literature/FromTheNewWorld'' is narrated by a roughly 40-year-old Saki; since she's not anywhere near that age until the very last scene, we know that she can't die. The story eventually has ''multiple instances'' of EverybodysDeadDave, so this is pretty important.
* A variation happens in ''Freddy Pharkas: Frontier Pharmacist''. The story is told by a local old coot, and would on a proper playthrough be about how Freddy saved the town. If you die, however, the HaveANiceDeath message is the coot ending the tale of how Freddy died. "And that's how Freddy Pharkas drowned in the swamp."
* Creator/HideoKojima ''really'' likes this trope a lot:
** In ''VideoGame/MetalGearSolid'', Mantis comments on how many traps Snake has fallen into—the traps are instant-death pits, suggesting Mantis is able to see Snake's Game Overs.
** In ''VideoGame/MetalGearSolid3'', the death of Naked Snake or Ocelot both result in the infamous "time paradox" game over screen. The future course of the story depends ''heavily'' on these two characters, so it just wouldn't do for them to die in the prequel.
** In ''VideoGame/MetalGearSolid4'', doing suicidal stuff to kill Snake and looking closely reveals invisible threads connected to him, as if he were a marionette. Much later in the game, he faces an enemy that can control others and uses the very same effect, implying those out-of-character suicides were actually because he was under mind control.
** In ''VisualNovel/{{Snatcher}}'', while the Continue function works as standard, the Chief will shout at Gillian after the factory opening if he dies during the attack of the Insectors. "Do you hear me, Seed? No more Game Overs!"
** In ''VisualNovel/{{Policenauts}}'', Jonathan will [[HaveANiceDeath complain]] if you get too many {{Game Over}}s, and then suggest hints (and if you carry on failing, simply say "I'm going to get him this time.")
* In ''VideoGame/MonkeyIsland2LeChucksRevenge'', there's no way to die in the game, except one time where you are disintegrated in acid. The person you are telling the story to immediately calls you on this, as you can't have been disintegrated if you're there telling the story, looking very integrated indeed.
* ''VideoGame/{{Persona 4}}'' goes to an unusual amount of effort to justify its anthropic principle. The moment you discover the TV world, it's obvious you'll be going there and fighting monsters, but the characters react realistically to this discovery rather than [[JumpedAtTheCall rushing in]], with the result that gameplay [[ProlongedPrologue doesn't fully open up until about three hours in]].
* ''VideoGame/PrinceOfPersiaTheSandsOfTime'' lampshades this. The story's FramingDevice is the Prince himself telling the story of HowWeGotHere, with gameplay proper being the WholeEpisodeFlashback. Whenever you get the Prince killed, we hear him tell us, "Wait, no, that wasn't how it happened. Hold on." After all, if the Prince had died, not only would the game's story not be told, but he wouldn't be here at this very moment to tell it.
* A very mind-screwy version happens in ''VisualNovel/Remember11''. When first starting the game, the viewer only has access to Kokoro's route and learns about Satoru even though he is never seen. After completing Kokoro's route, Satoru's side of the story is activated. [[spoiler:It is implied that due to an extradimensional entity [[note]]Which is actually you, the player[[/note]], Satoru's reality is warped based on what was previously known in Kokoro's route.]]
* The game ''VideoGame/{{Sacrifice}}'' features the same conceit as the ''Monkey Island'' example above, with almost the same line: "Of course, that's not what really happened." The protagonist is explaining the story to one of the acquaintances he met during it.
* In ''VideoGame/SpaceQuestVTheNextMutation'', Roger Wilco must keep his love-interest, Beatrice Wankmeister, alive, or else get a game over. Why? Because the fact that she and Roger eventually have a son is part of the premise of the time-travel laden ''VideoGame/{{Space Quest IV|Roger Wilco and the Time Rippers}}'', as the son saves Roger in the opener of that game. If Beatrice does not survive, Roger Jr. will not be born, cannot travel back in time to save his dad, and thus ''Space Quest V'' can not happen!
--> '''Narrator''': Bea is dead. In an alternate future, she would have borne your son. In the future past of Space Quest IV, your son would have saved your life. But she didn't... so he couldn't... therefore, you aren't.
* Part of the InteractiveFiction game ''VideoGame/SpiderAndWeb'': You're interrogated in a flashback, but with an audience, and if you do something unbelievable in the flashback, he'll stop you and insist you tell the truth. [[spoiler:This is eventually subverted as the main puzzle of the game is to give a a plausible explanation for the starting conditions of the game, while at the same time hiding what you did prior to capture that will allow you to escape.]]
* The gameplay aspects of CallOfJuarezGunslinger are the memories of Silas Greaves as he relates his life to a group of saloon patrons—his memories dictate how you have to play. Unusually this is crossed with UnreliableNarrator, as Silas will sometimes change his mind about a memory and you have to play it again differently. Of course he, and therefore the player, didn't die, otherwise he wouldn't be telling his stories in the present.
* In ''VisualNovel/ZeroTimeDilemma'', successfully escaping the Rec Room with C Team causes Akane to talk about how the Anthropic Principle applies to their situation. The probability of having succeeded in their final task in the escape room was only 1/216 or 0.46%, but despite those odds, the only way for them to be there, in that situation, is if they succeeded. [[spoiler: The same could be said for her very existence, because if Junpei had not been there in the first place, she would not have survived the first Nonary Game.]]

* Tarquin exploits this in ''Webcomic/TheOrderOfTheStick'': For a "hero topples an evil empire" story to take place, the evil empire has to exist, and have existed for quite some time, and be in a position that they'll continue to exist if no hero topples them. And that all requires someone to rule the empire, with all the benefits thereof -- so why not him? As he puts it, the EvilOverlord gets to live like a god for decades, and while the last few minutes were pretty bad, you can't have ''everything'' in life.

[[folder:Web Original]]
* Though it is never mentioned explicitly, the anthropic principle is the entire premise of [[http://lesswrong.com/lw/14h/the_hero_with_a_thousand_chances/ The Hero with a Thousand Chances]].
* In ''{{Webcomic/Homestuck}}'', [[HandicappedBadass Terezi]] is able to ''weaponize'' the Anthropic Principle. When fighting an enemy that can [[WindsOfDestinyChange steal and manipulate luck]], she makes sure that the only outcome that preserves the "Alpha Timeline" (essentially the main narrative) is the one where she wins.
* In ''Webcomic/OnePhoneCall'', Garth ends up in prison, so it's pretty obvious that none of the dangerous things in his story of [[HowWeGotHere how he got there]] end up killing him.
* After watching the movie ''Cyclone'' on ''WebVideo/BestOfTheWorst'', Rich points out how nonsensical it was for the evil corporation to murder the titular motorcycle's inventor to get their hands on it, when he was '''working''' for them, and as such they already had full ownership of the technology. Jay flatly explains that they did it because otherwise the rest of the movie wouldn't happen.

[[folder: Western Animation]]
* All but named outright at the start of ''{{WesternAnimation/Rango}}'', when the titular lizard declares that his character is undefined and that "the hero cannot exist in a vacuum! What our story needs is an ironic, unexpected event that will propel our hero into conflict!" ''No sooner does he say this'' than he is forcibly ejected from his owner's vehicle into the desert, at which point the story begins.