->''"A man is his own easiest dupe, for what he wishes to be true he generally believes to be true."''
-->--[[OlderThanFeudalism Demosthenes]]

A character, typically an antagonist, is known for for making some outrageous claims. Either [[MaliciousSlander vicious attacks against their foes]], [[AGodAmI claims of divinity]], or [[MilesGloriosus consistently twisting events so they look better]].

In anyone else, these could be called out as BlatantLies. But what sets this character apart is that, contrary to all evidence and the fact that they, by all rights, ''should'' know better, they honestly believe every word they're saying.

However sane they may have been when they started, they've gone over the deep end and are now Believing Their Own Lies.

DoubleThink is an extreme example where the said liar does know better but keeps believing his own lies simply because he can. SisterTrope to AGodAmI, where there is frequently overlap. The key difference is that this trope is less specific and doesn't ''have'' to be a claim of Godhood. This trope also applies only when the character should know perfectly well they ''aren't'' a god, but have convinced themselves otherwise. Characters suffering from this trope are also prone to a SelfServingMemory.

See also BecomingTheMask, in which a character assumes a fake identity he ultimately wishes to keep; and the AmnesiacLiar, who gets fed their own lies after memory loss. A StrawHypocrite, who manipulates others by feigning to follow a cause, may get taken in by their own rhetoric this way. Compare {{Conspiracy Theorist}}s, who think their outrageous claims are true from the get-go. With a little ObfuscatingStupidity, one can ''pretend to'' believe for as long as this gives an advantage.

----
!!Examples:

[[foldercontrol]]

[[folder:Anime & Manga]]
* The manga-only arc Onisarashi-hen from ''HigurashiNoNakuKoroNi'' has Natsumi [[spoiler: stating to the police that her mother killed her grandmother, then, after hiding the body, stabbed her father in the back of the neck for being incompetent and useless, then killing herself by slashing her throat open with a knife that she tried to kill Natsumi with.]] In chapter 7, [[spoiler: we find out that Natsumi commited all of the murders; she killed her grandmother, then got her parents to help hide her, stabbed her father in the front of his neck, and then killed her mother after she called for help when Akira called the house.]] Didn't you think [[spoiler: that Natsumi being the only one getting covered in blood, even though she wasn't killing anyone, was kind of wierd?]]
* God Eneru in ''Manga/OnePiece'' had serious AGodAmI issues. While knowing that, in the Sky Islands, "God" is merely a title for an island's leader, Eneru's [[ShockAndAwe Lightning-based Rumble-Rumble Fruit powers]] combined with the near-omnipotence granted by his enhanced mind-reading Mantra ability convinced him that he truly ''was'' divine.
** Buggy the Clown; breaking a bunch of prisoners out of their cells in order to facilitate his escape from [[TheAlcatraz Impel Down]] caused him to start being referred to as "The Great Buggy-sama". This hit a critical mass when it emerged [[spoiler:that he once served on the Pirate King's ship, alongside one of the current Four Emperors.]] As a result, he started thinking he had a chance of taking Whitebeard's head. To put that in perspective, Buggy is on the low end of ''One Piece's'' SortingAlgorithmOfEvil, and Whitebeard is called WorldsStrongestMan with zero exaggeration.
* A villain of the week from the ''Manga/YuGiOh'' manga was a fake psychic (who physically made his prophecies of doom come true.) At the end, he's in a tight spot where only manifesting actual psychokinesis can save him, and he believes so hard he actually hallucinates that it's working.
[[/folder]]

[[folder:Comic Books]]
* In an ArchieComics story, Veronica tells Archie and Reggie that whoever scores the most baskets in the next school game gets to take her out that weekend. Reggie attempts to sabotage Archie by telling him that the best way to improve his basket-shooting is to criticize himself constantly and harshly while practicing. This goes Reggie's way until Coach Clayton sets Archie straight, telling him that he should do the opposite while practicing and build up his confidence. Archie indeed goes on to score the most baskets, leading Reggie to wonder whether there was something to his "advice" after all. The story ends with Reggie practicing while berating himself and surrounding himself with demotivational posters.
* DependingOnTheWriter, sometimes LexLuthor ''actually believes'' that he is fighting to protect humanity from {{Superman}}. Other more minor villains, like (the most recent version of) Sam Lane, may believe the same.
* ''ComicBook/UnknownSoldier'' from DC Comics, one of the versions. He is there when America liberates a Nazi concentration camp. He kind of snaps. Now he believes that whatever America does is right, no matter how horrible, because they once fought against the horrible Nazis.
* In the ''Franchise/AvatarTheLastAirbender'' comic ''[[ComicBook/AvatarTheLastAirbenderRebound Rebound]]'', Mai's father seems sincerely to have deluded himself into believing Fire Lord Zuko abandoned his daughter and kicked her out when it's common knowledge that ''Mai'' is the one who left ''Zuko''.
* TheJoker sometimes believes his MultipleChoicePast, DependingOnTheWriter of course. One issue of The ''ComicBook/RobinSeries'' had him actually in tears as he told the psychiatrist of his [[AbusiveParents abusive childhood]], only for the psychiatrist to coldly point out that it's the ''seventh'' story he's told now.
[[/folder]]

[[folder:Fan Fics]]
* The LemonyNarrator to the essay-fic [[FanFic/EquestriaAHistoryRevealed Equestria: A History Revealed]], straight-up reveals at one point that she's been making up most of the history as she goes along. That doesn't stop her from continuing to write her version of history and being outraged all the same though.
[[/folder]]

[[folder:Film]]
* In the 1954 Biblical epic ''The Silver Chalice'', Simon the Magician (Jack Palance) is a conman who gets rich by faking miracles. He convinces Caesar that he is able to fly, but eventually comes to believe in his own magic, jumps off a tower, and plummets to his death.
* In the 1995 film ''Dead Man Walking'' Matthew Poncelet has convinced himself that he didn't [[spoiler:rape a girl and then brutally murder her and her boyfriend]]. He holds firm to this claim for a large part of the film. However, towards the end when he is pleading against his sentence to [[spoiler:the death penalty]] he breaks down and admits that he did, in fact, commit the crime. While this could be seen as him admitting what he already knew, it is far more likely that he purposely suppressed those memories and began to believe his own lies. Thankfully he [[RedemptionEqualsDeath redeems himself]] at the end.
* Marcy seems genuinely surprised by the rashes she finds on her back, shortly after assuring Paul that she was perfectly healthy in ''Film/CabinFever''. Even after seeing the rashes, she seems to convince herself that they are just marks left from when he grabbed her.
* ''Film/TheInformant'': TheReveal of the film is that [[spoiler: the main character]] is a compulsive liar with an extraordinary talent for self-deception.
[[/folder]]

[[folder:Literature]]
* David Weber has done this in two of his series:
** Cordelia Ransom, from ''Literature/HonorHarrington'', is the head of the Office of Public Information for the People's Republic of Haven. She is the one who manages the PRH's propaganda, and in ''In Enemy Hands'' Citizen Admiral Thomas Theisman is horrified to realize that she seems to genuinely believe every word she broadcasts, and we see that her fellow heads of state are very concerned that Ransom believes her own propaganda.
*** The Masadans also believe things happened in a way that can't possible be true, all so that they can hold their women in less than slavery and continue to pursue their goal of destroying Grayson.
** Also from DavidWeber are the "Archangels" of the ''Literature/{{Safehold}}'' series, especially Langhorne and Bedard. They set up a PathOfInspiration specifically to keep humanity from developing technology again, in violation of the original plans for their mission, in part to satisfy their own megalomania. Pei Kau-Yung grew concerned that they had actually come to believe they were angels.
** And also from ''Safehold'', this is, and is lampshaded as, the single creepiest attribute of church leader Zhaspahr Clyntahn--no matter what he does, he can come up with a justification for why it's the best course of action for everyone (and not just for him personally), often one that requires blatant disregard of facts he knows and doesn't know everyone else knows, and he seems to have compartmentalized his mind to such a degree that he can think himself innocent even as he knows he's guilty. [[spoiler:There's a scene in the third book where he and his fellows debate the proper course of action in response to a murder apparently committed by an enemy of the church. The others realize one by one that ''he'' paid the assassins, just so the enemy of the church would be blamed, but at any intimation the others make of this he's as indignant as if his conscience was spotless.]]
* In the KurtVonnegut novel ''CatsCradle'', Bokonon and Earl [=McCabe=], rulers of the fictional West Indian country San Lorenzo, create a new religion, Bokononism, in order to improve their subjects' lives. To increase the new religion's appeal to the masses, [=McCabe=] [[ForbiddenFruit outlaws its practice upon pain of death]] (while practicing it in secret), whereupon Bokonon "flees" into the jungle, a "wanted" man. Over time, however, the two men become so habituated to their respective roles in the charade that they go insane and become enemies for real.
* DoubleThink from ''Literature/NineteenEightyFour'', without which the entire system would collapse: The ability to consciously lie and tell propaganda, yet at the same time believe every word of it.
* ''Literature/TheLordOfTheRings'': Gollum really believes that the ring was supposed to be his birthday gift. However the ring is shown to corrupt every being who bears it, given a long enough time period. A major element of this corruption is that all it takes is close proximity to the ring to make a being eventually come to believe that they deserve to have it; that it is right and true and fair that they possess and wield it.
* A minor character, [[spoiler:Mrs. Luxmore,]] in the Creator/AgathaChristie novel ''[[HerculePoirot Cards On The Table]]''. This led to Major Despard being part of Mr Shaitana's collection of uncaught murderers, because she'd convinced herself he'd killed for her. To elaborate: [[spoiler: Mr. Luxmore was a botanist who hired Major Despard as a guide to a jungle tour. During the trip, Mrs. Luxmore made advances on Despard, who did not reciprocate. Mr. Luxmore suffered from a bout of fever and fell into delirium one night. Major Despard followed with his rifle, intending to merely take down the raving Luxmore without hurting him. Mrs. Luxmore surprised him and believed he was about to kill the botanist for her, so she tackled Despard, changing his nonlethal shot into a killing one. The woman lived for years with imaginary guilt over the incident.]]
* Must be the case with Nozdryov in ''DeadSouls'', who tells a lot of bullshit, even in court. You'll have to read it to see how much he [=BSs=].
* Because of their tendency to lose their old memories to TheFogOfAges, the Marra of ''Literature/TheMadnessSeason'' who live for too long under a particular cover story eventually wind up believing it, to the point that they actually think that they are mortal and can die.
* In James P. Hogan's ''Giant's Star'', the leaders of a race of TransplantedHumans has been concocting false reports of a dangerously warlike Earth, in order to get permission (from the alien civilization that transplanted them) to neutralize the threat. The protagonists counter this by hacking into the schemers' central computer and making it think that Earth actually ''was'' militarized and ready to kick their asses. This left the enemy leaders in a state of befuddlement that [[ParanoiaGambit escalated into panic]] as the reprogrammed computer [[{{Gaslighting}} insisted that it had been reporting about the danger for years]] and didn't understand why no adequate defenses had been prepared.
* Discussed in ''Literature/{{Liar}}'':
-->Yet that's not the worst danger of being a liar. Oh no. Much worse than discovery, than their sense of betrayal, is when you start to believe your own lies.
-->When it all blurs together.
-->You lose track of what's real and what's not. You start to feel as if you make the world with your words. Your lies get stranger and weirder and denser, get bigger than words, turn into worlds, become real.
-->You feel powerful, invincible.
* A rare positive example in ''Literature/TheStormlightArchive'''s Lightweavers. For these people, BelievingTheirOwnLies really ''can'' make those lies truth.
* This is a key plot-point in ''Literature/TheDaggerAndTheCoin'': the priest of the spider goddess have the magic power to make anyone who hears their voices believe whatever they say. This includes themselves. As a result, they become completely certain that they are invincible and can conquer the whole world. At the same time, once they are divided in multiple temples in multiple cities, each group starts to become completely certain of its own particular version of the faith, and just as certain that the other temples are all heretics. As such, their empire begins to come apart.
[[/folder]]

[[folder:Live Action TV]]
* The Goa'uld in ''Series/StargateSG1''. They're such {{Large Ham}}s that it's impossible to believe they ''don't'' actually think they're gods. Ba'al and Anubis stand out, and have the advantage, by being savvy enough to remember they're not ''really'' gods. And even Anubis sometimes falls victim to this trope...and given that his [[AscendToAHigherPlaneOfExistence half-ascended]] nature makes him more "god-like" than the rest, that shouldn't come as a surprise. Ba'al, however, doesn't even keep up the pretense of pretending to be a god when he's among characters who know the truth.
** An early episode, "The First Commandment," also featured the commander of an [=SGC=] team who fell into this trap himself and had to be put down by SG-1. In this case, though, the man had also likely gone insane from over-exposure to the planet's incredibly harsh UV radiation.
** The Ori, being [[AscendToAHigherPlaneOfExistence fully ascended beings]] who [[GodsNeedPrayerBadly can enhance their already-immense power through prayer]], likewise believe themselves to be gods. The problem is, they pretty much ''are'' (what with the immortality, non-corporeality, and nigh-omniscience and omnipotence), raising the issue of exactly what defines a "god" if the Ori don't qualify. The good guys don't ever really come up with a fully satisfactory answer, but they do sway a few of the Ori's followers by demonstrating that while the Ori have the ''power'' of gods, they certainly don't behave like the loving and benevolent overlords they claim to be.
* This is a possible interpretation of Sue Sylvester from ''Series/{{Glee}}'', seeing as how she keeps up the crazy claims even in her own diary.
* ''MidsomerMurders'' has two guys running a spiritual center for years, only for one of them (the guru) to start believing in all his NewAge-inspired nonsense, to the chagrin of his partner who wants to lead a different life.
* One of the villains (a cult leader) from an episode of ''LawAndOrderSpecialVictimsUnit'' started to believe his own hype and go a bit AGodAmI. This caused his followers to turn on him.
* When ''Series/KamenRiderDouble's'' Detective Jinno was a beat cop, he had the effect of ''inducing'' this in others by being so gullible that the delinquents lying to him to get out of trouble would end up BelievingTheirOwnLies. It's a CrowningMomentOfFunny when, after repeatedly distracting Jinno with claims of a UFO, a young [[TheHero Shoutarou]] eventually ended up searching for [=UFOs=] with him. [[spoiler: And a CrowningMomentOfHeartwarming when a girl in a group of teenage vigilantes lying about having given up fighting, but having to do so to save her friends. Jinno believed her so wholeheartedly that she genuinely did give up fighting after that.]]
* On ''Series/{{Seinfeld}}'' George gives Jerry some advice on being a ConsummateLiar and beating a lie-detector test with this little gem: "It's not a lie if you believe it."
* Vince Gilligan says that the writers of ''Series/BreakingBad'' consider this to be Walter White's greatest talent.
--> "We always say in the writers’ room, if Walter White has a true superpower, it’s not his knowledge of chemistry or his intellect, it’s his ability to lie to himself. He is the world’s greatest liar. He could lie to the pope. He could lie to Mother Teresa. He certainly could lie to his family, and he can lie to himself, and he can make these lies stick. He can make himself believe, in the face of all contrary evidence, that he is still a good man."
* An episode of ''Series/StarTrekTheNextGeneration'' is told in {{Rashomon}} style. Riker is accused of murdering a scientist and attempting to assault his wife, and a holodeck simulation is rigged up for each of the witnesses. These scenes all drastically contradict each other but Deanna, the Enterprise Counsellor (and conveniently, also an Empath), says that each person ''believes'' their story to be true so far as they remember it.
[[/folder]]

[[folder:Tabletop Games]]
* Cyric, the God of Lies from ''TabletopGame/ForgottenRealms'', guided a mortal author to write a book called the Cyrinishad which would [[BrownNote make anyone who read it or hears it read aloud]] believe that Cyric was the greatest of all gods. He then read it himself, and fell victim to its enchantments, bringing his megalomania to new heights. For a time, he saw his enemies as too "insignificant" to care and even got Madness [[OddJobGods in his portfolio]]. Later it was discovered that the only way to get rid of this for a ''deity'' involves a drop in DivineRanks.
* The Balseraph demons from ''TabletopGame/InNomine'' essentially have this as the core aspect of their character. As fallen Angels of Truth, they become Demons of Deception, capable of weaving lies that others end up believing without question. But to do this, a Balseraph must first convince ''himself'' of the lie, warping his own personal truth to reflect the lie. For example, a Balseraph trying to convince a bar bouncer that he's a VIP must first convince himself that, "Yes, I'm a VIP, and I've been at this club dozens of times. Why isn't that bouncer letting me in already?"
* Desus in ''TabletopGame/{{Exalted}}'' honestly believes his own VillainWithGoodPublicity reputation, because he's affected by the same mind-manipulating magic that forces everyone else to rationalize his horrible actions away.
* In ''{{Rifts}}'', [[TheEmpire the Coalition States]] High Command likes to blame all the ills in the world on [[FantasticRacism magic and non-humans]]. In the beginning it was just a convenient {{Scapegoat}} Emperor Prosek and his advisers used in order to grab more power. However, they've been telling their people the Big Lie for so long that they now believe it themselves.
[[/folder]]

[[folder:Video Games]]
* ''VideoGame/AsurasWrath'': The game's plot is kicked off with the other members of the Eight Guardian Generals assassinating Emperor Strada and [[{{Frameup}} framing]] Asura for it. Throughout the rest of the game, the Guardian Generals, now the Seven Deities, repeatedly call Asura a traitor without irony, indicating that they themselves have come to believe that Asura really did assassinate the Emperor over the millennia.
* In the on-line game, ''WarOfLegends'', most of the Paladins honestly believe they are gods and that the game couldn't have been even thought of without them. Adding to the fact, they believe they won battles they clearly lost and make up excuses to avoid having to claim defeat while not letting others use the exact same excuses.
* [[PlayerCharacter Captain Martin Walker]] in ''Videogame/SpecOpsTheLine'' believes his own lies [[spoiler: regarding his bombing of a civilian camp with [[KillItWithFire white]] [[BodyHorror phosphorus]]]], because [[NeverMyFault he cannot accept]] [[IgnoredEpiphany what he has done]].
* Celestia Ludenberg in ''VisualNovel/DanganRonpa'', also known as 'Queen of Liars' and 'Super High-School Gambler', is capable of lying in a way that she could even believe own lies. Or so she claims. However, based on her free time events, we could probably guess that [[spoiler:she probably also LIED on her identity and history, which are based on highly daring and impossible events you can only find in fictions, and her real name was a much more common 'Taeko Yasuhiro'. She got so over in her lies that she believed that she really is born as 'Celestia Ludenberg'.]]
* [[TheFundamentalist Zachary Comstock]] in ''VideoGame/BioshockInfinite'' first used Rosalind Lutece's invention to look into alternate realities and predict the future so as to set himself up as God's prophet. Somewhere along the way, he began to buy into his own act. Besides the quote below, though, it's telling that even after it's revealed that his prophetic abilities are mostly derived from the Luteces' machine, he still refers to his visions as having come from an "Archangel".
--> '''Rosalind Lutece:''' When I met Comstock, he was little more than a preacher, able to move both members of the flock or members of Congress with equal dexterity. He believed in my work, and his influence bought the funds I so needed. And if he wanted to use Tears to play prophet, that was his prerogative. But at some point, the man became incapable of distinguishing his performance from his person.
** Taken UpToEleven in the "Burial at Sea" {{DLC}} set in Rapture, where that dimension's Booker is revealed to be [[spoiler: an alternate version of Zachary Comstock who fled to the underwater city and assumed the private detective's identity to escape the guilt he felt over causing the death of an alternate version of Elizabeth. The deception was so thorough that Comstock truly believed he WAS that world's Booker. As Rosalind Lutece puts it, Comstock was never one to own up to his own errors.]]
* ''VideoGame/InjusticeGodsAmongUs:'' After the Joker [[spoiler: [[NukeEm nukes Metropolis]] and uses the Scarecrow's fear gas to trick Regime Superman into killing Lois Lane]], Regime Superman kills him with his bare hands and subsequently convinces himself that it was "[[HeWhoFightsMonsters one death to save millions of lives]]." Of course, anyone who saw it can tell right away that he was motivated by vengeance, ''not'' justice.
* Referenced in the credits song for ''VideoGame/MetalGearRisingRevengeance''. There's a part of the lyrics which states "Even men with the greatest intentions can end up believing their own lies." This illustrates a common theme in the context of the story where multiple characters are [[WellIntentionedExtremist well intentioned extremists]] who want to change the world through very drastic measures, including even the main protagonist Raiden who uses extreme violence to punish organizations, harshly and permanently, that he views to be evil. The dissonance comes from Raiden viewing himself to be an enforcer of justice, while using arguably evil methods to reach those goals; how can a man claiming to uphold justice feel like a good person knee deep in bodies?
[[/folder]]

[[folder:Webcomics]]
* This was one of the critical flaws of ''Webcomic/TheOrderOfTheStick's'' Miko Miyazaki. She was fundamentally incapable of seeing herself in the wrong, and would frequently convince herself of whatever she had to in order to keep it that way even after [[spoiler: the gods themselves strip her of all her LawfulGood based powers]].
** Additionally, Ian Starshine (Haley's father) raised his little girl in a WretchedHive and taught her to lie at ''every opportunity'' whenever asked about herself. He's so paranoid he's incapable of taking people at their word and will invent elaborate scenarios which justify his ridiculous position and seems to totally believe them.
* In ''Webcomic/{{Katamari}}'', Ace is completely convinced that the Prince is a prideful, selfish AttentionWhore who'll do whatever it takes to come out on top. In other words, he thinks the Prince is [[{{Jerkass}} just like him]].
* In one of the ''Webcomic/LasLindas'' side-stories, a young tribal girl tries to set up an outsider as a god so that she can leave her island. And then the [[BrickJoke gophers]] that Minos threw with his super-strength start falling from the sky. She ends up getting a job at Las Lindas a few months later to follow Idward.
[[/folder]]

[[folder:Western Animation]]
* [[ComedicSociopath Master Shake]] of ''WesternAnimation/AquaTeenHungerForce'' seems to be pretty good at this. In the third episode of the first season, ''Bus of the Undead'', he completely makes up a story about how the school bus parked outside the Aqua Teen's house is "a [[OurVampiresAreDifferent reverse vampire]]" and "possessed by the ghost of {{Dracula}}," because he was watching ''Assisted Living Dracula'' at the time. Despite the fact that this is entirely his own invention, he proceeds to operate throughout the rest of the episode as if everything he made up was real, to the point where he runs screaming back into the house after a failed attempt to "drive this stake deep into the heart of the crankcase of the vampire bus."
* An episode of ''WesternAnimation/SouthPark'' involves Jimmy coming up with a gay fish joke. Cartman was lying on the couch the entire time and at first, he claims both he and Jimmy made it up together. Eventually he starts claiming he was the only one who wrote the joke while Jimmy was the one on the couch, and each time the story is told, he adds an increasingly outlandish event to it. It turns out he really does believe his own lies.
** This happens again in "Jewpacabra", where Cartman spreads vicious rumors about a Hebrew-based monster attacking at Easter. Somewhere along the way, Cartman starts to believe his own story, hiding in fear of being attacked.
* Happens to Angelica on ''WesternAnimation/{{Rugrats}}'' a few times.
** In one episode, after tricking Chuckie into thinking a disease she made up is turning him into a rhinoceros, a horn-shaped bump on her head, along with gray-colored scabs on her legs, leads her to think that ''she'' has contracted "rhinoceritis". Also counts as LaserGuidedKarma.
** After all the babies come down with chicken pox, Angelica, being the AlphaBitch that she is, convinces them that they will all turn into actual chickens. By the end of the episode, she herself has contracted the pox, and when an egg falls into her car seat, she freaks out and believes that she's turning into a chicken herself.
** And let's not forget the episode in which she tried to convince the babies that the sky is falling, and ends up believing it herself.
* ''WesternAnimation/SpongeBobSquarePants'': The episode "I'm With Stupid" has [=SpongeBob=] and Patrick come up with a plan to make Patrick's parents believe that [=SpongeBob=] is a complete idiot so that Patrick will look smarter by comparison. Unfortunately, Patrick takes it too seriously and soon ends up believing that he truly is a genius and [=SpongeBob=] really is dumb.
* An episode of ''WesternAnimation/ThePowerpuffGirls'' had Mojo learning that the girls fear [[GirlsHaveCooties cooties]] and using a boy to scare them off so he can take over Townsville. The only problem is he starts to genuinely believe the cooties are real, and uses the kid in a trap to defeat the girls. All it does it get them to realize the truth. They leave the boy CoveredInKisses and defeat Mojo.
[[/folder]]

[[folder:Real Life]]
* [[http://en.wikipedia.org/wiki/False_memory_syndrome False memory syndrome]], a condition in which a person's identity and relationships are affected by memories which are factually incorrect but are strongly believed. This is a common trait of [[http://en.wikipedia.org/wiki/Mythomania compulsive liars]].
* [[ChurchOfHappyology L. Ron Hubbard]]
** Possible subversion? L-Ron himself never intended Scientology to be an ''actual'' religion. He wrote it as a '''science fiction novel'''. So this is a case of ''other people'' believing someone's lies.
*** He supposedly wrote it to win a bet with fellow sci-fi author Robert A. Heinlein, on whether a sci-fi writer could actually start a "cult of personality" around their works. Supposedly, ''Literature/StrangerInAStrangeLand'' was Heinlein's attempt. The story goes that Heinlein backed off when he saw that it was ''working'', while Hubbard [[AsYouKnow did not]]. The rumor dates from over a decade before the Manson Family murders and People's Temple incident highlighted how abusive personality cults actually were, eventually leading to the discovery that the supposedly "good" personality cults of Stalin and Mao were actually much worse than propagandists made them seem at the time. There is no proof of the bet, though there are several witnesses who overheard their discussion (or claim to have). In any case, Hubbard himself quickly acclimated to his new role as cult leader, and many of Scientology's most successful practices (especially the "Attack the Attacker" policy that causes most of the controversy) were instituted on his explicit orders. Whether Hubbard ever came to actually believe in his own lies is debatable, but he certainly came to believe that profiting off the actions of the literal cult he created was perfectly ethical, regardless of the lives they destroyed in the process, as long as it remained legal.
** Hubbard asked the military to provide him with the citation records of the combat medals he'd earned in every theater of World War II. This surprised the military, as Hubbard had never served in combat, and only served in the Pacific theater.
* [[ThoseWackyNazis The Nazis]].
** To glue the new enemy to the old one, Nazi propaganda made up JosefStalin's imaginary 3rd wife -- "Rosa Kaganovich". When Yakov Dzhugashvili was captured and interrogated they asked him about his father's private life, including this imaginary "last wife", which suggests that they saw her as real. By some accounts, they even mistook Yakov himself for her son. Unusual in that this fairy tale survived longer than its authors -- after the war this "''secret'' wife" eventually turned into "Dr. Rosa Kaganovich ''Stalin''" and even "mother" of Yeltsin's wife.
** The Nazi-propagated belief that Hitler was some kind of infallible genius and [[MessianicArchetype Germany's God-appointed savior]]. As time went on and Hitler racked up achievement after achievement (rearming Germany, taking over Austria and Czechoslovakia, "solving" Germany's economic problems), he started to believe it himself. It got to the point where German officials of the era are often seen in the memoirs of those who had deal with them as completely deprived of critical thinking. Historian Ian Kershaw wrote extensively on the so-called "Hitler Myth"; he calls this moment "the beginning of the end for the Third Reich".
* The so-called 'planning' for ''Unternehmen Barbarossa''. Where to start...
** Logistics department says it's ''insane'', they'll only have enough fuel to sustain combat operations for two months. Solution? The entire war will last two months.
** Head of Logistics asks what happens if the war isn't over in two months? Head of General Staff, Halder, laughs and says "and what if it is?"
** Three teams work on operational plans for an offensive war with USSR. All three conclude that The Red Army will be totally destroyed within two months and that Soviet resistance will collapse at this point, allowing German forces to use the railroads to more or less ride straight to Leningrad, Moscow, Kuiybyshev, and Baku and take them all in just a month.
** One study concedes the possibility that some "limited, minor" Soviet resistance may continue from Soviet Asia, but thinks it unlikely.
** All studies predict that supply problems identified by Head of Logistics (lack of food, fuel, trains for troops) will be ameliorated by support from local populations. No studies anticipate any kind of rebellion or partisan warfare.
** Most fundamentally, no-one ever suggests that ''Barbarossa'' might fail and that the Soviet Union will respond to their 'War of Annihilation'/'Total War' with a 'Total War' of their own. In reality they end up taking ''four months'' to take the objectives (Minsk, Riga, Smolensk, Kiev) they'd expected to take in the first two months - and by then their panzer and motorised forces are down to half-strength (rather than being at or close to full-strength, as the plans had 'predicted' [[SarcasmMode with their usual presience]]). Halder wins a colossal argument with Hitler (who thinks it's risky and pointless) and manages to get these depleted forces immediately thrown into an attempt to take Moscow.
** Head of Logistics protests, because they are only barely able to get enough food and fuel to the front to keep the men from starving and the panzers running, and there's very little ammo making it through. This means there is no room for spare parts for the panzers (which means that even ones with the most minor and easily-repaired damage are put out of action) or for winter equipment and clothing. Halder says that Moscow will be taken before winter sets in, and when they do then the Soviets will surrender and they can transport the clothing to them instead of ammunition and fuel.
*** Conclusion: In 1940-41 Germany pioneered a miraculous new solution to logistical constraints: ''Racial Superiority''.
* UsefulNotes/ImperialJapan.
** When UsefulNotes/WorldWarTwo began to 'go south', the [[KatanasOfTheRisingSun Army and Navy]] of UsefulNotes/ImperialJapan took its constant and comprehensive lying about the losses it inflicted and raised them to new heights. While censorship and propaganda was a given in the media of Imperial Japan, especially [[UsefulNotes/SecondSinoJapaneseWar since the outbreak of war in 1937]], the post-1941 situation was unique in that the country's military leadership also began to ''deceive itself'' when reporting the outcome of various actions as well as its overall strength and disposition (and that of the enemy). Only a tiny handful of individuals at the very top of both services actually knew what was going on concerning any one issue like troop strength or aircraft production or food reserves - the Showa Emperor ensured that full knowledge of the war effort was known only to General Tojo and himself (and, when Tojo fell, 'just' himself). [[note]] The increasingly disastrous defeats and ineffective attacks were rewritten as glorious victories and crushing defeats inflicted upon the Allies. The army often claimed fantastic victories (when they in fact had been defeated) and assigned their commanders ludicrous objectives based upon these assumptions, and the navy and the air force again and again claimed to have sunk entire American fleets, even when they had sunk no ships at all (certain American vessels, such as the ''Enterprise'' and the ''Essex'' were claimed to have been sunk multiple times). The Japanese high command, desperate to hold off the Americans, eagerly swallowed these lies and didn't bother to confirm them before informing the other branches of the service. This had disastrous consequences for all concerned; the army would often launch attacks and hold impossible positions because the navy blustered that the American fleet had been sunk, and vice versa.[[/note]] Although decades of 'reading between the lines' meant the Japanese people ''knew'' things were going to hell, the true extent to which the country was on the verge of total socio-economic-demographic collapse and military defeat (i.e. a few months)[[note]]the country had been a large importer of food before 1944. The food shortages resulting from the Allied blockade were a death sentence for hundreds of thousands, if not millions, in the upcoming winter of 1945-6. ''Operation Downfall'', and the millions of deaths it entailed, was also just a couple of months from being implemented.[[/note]] still came as a shock to many upon the Empire's surrender.
** Hell, when the Emperor declared surrender, several of his generals were so certain they could still win that they plotted his assassination. ''This was '''after''' Nagasaki.''
* Korsakov's Syndrome. It's a form of amnesia brought on by excessive alcohol abuse. To cover up for their forgetting, patients will invent information that sounds highly plausible to everyone else and eventually come to believe it themselves.
* There is an epigram assigned to Lenin that may or may not be apocryphal which goes "A lie told often enough becomes the truth."
** This saying has also been attributed to Trotsky, Stalin and Josef Goebbels.
*** BeamMeUpScotty: It actually comes from Joseph Goebbel's Propaganda Principle of orchestration.
---->"Propaganda must be limited to a small number of ideas and be repeated tirelessly, presented over and over again from different perspectives but always converging on the same concept. No cracks or doubt". Indeed, the 'original' phrase would be more along the lines of "the bigger the lie, the harder it is to disprove".
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