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1->''"If I go like this, ''[touches palm to forehead]'' my wife says, 'Are you feeling all right?' But on television nobody notices, you see."''
2-->-- '''Creator/TomBaker''' on ''Series/DoctorWho'', "[[Recap/DoctorWhoS14E2TheHandOfFear The Hand of Fear]]"
3
4A close relative of EvilTwin and FreakyFridayFlip, Not Himself is any plot where a character acts contrary to the way they normally behave. Can be used to provide a mystery to be solved, or to incite bewilderment in the other characters. The deviation is often a marked increase in [[DemonicPossession evil]], insanity, and/or horniness: the emergence of the [[ShadowArchetype inner shadow]]--or a [[SpotTheImpostor switcheroo]].
5
6Sometimes, it's a detective or police character behaving as if they were corrupt, or a criminal. This will usually turn out to be the FakeDefector. On other occasions, it might be the result of DemonicPossession.
7
8If the change is deliberate to save their friends, it's an invoked OutOfCharacterAlert.
9
10If the change is caused by poor writing or is never given an in-canon reason, this could be CharacterDerailment.
11
12Compare OutOfCharacterMoment and WeirderThanUsual. Contrast with SomethingOnlyTheyWouldSay. See also VirusVictimSymptoms. Not to be confused with NotAsYouKnowThem, where an established character's significance in a production is derailed or minimized order to benefit another character (usually to replace them).
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14----
15!!Examples:
16[[foldercontrol]]
17
18[[folder:Advertising]]
19* This is the premise of Snickers' "You're Not You When You're Hungry..." commercials, featuring normal people acting more like larger-than-life celebrities, including Creator/RobinWilliams, Creator/BettyWhite, and Creator/DannyTrejo as Film/{{Machete}}, being brought back to normal after having a Snickers bar.
20[[/folder]]
21
22[[folder:Anime & Manga]]
23* ''Manga/{{Berserk}}'':
24** Played for drama toward the last chapter of the Golden Age Arc, which concludes the prologue that dives into Guts' backstory about [[HowWeGotHere how he came to be]] the dark, brooding and vengeful man [[EstablishingCharacterMoment that he was introduced as]] in the Black Swordsman Arc. Although they were not present at the harrowing Eclipse [[spoiler: a tortuous event triggered by Griffith, his former friend, when he [[FaceHeelTurn turned to the dark side,]] ending with the sacrifice of his comrades and the rape of his lover]] Godo, Rickert, and Erica noticed the dark shift in Guts' character, which not only involved the increased blood-lust in his personality, but also his dark dress and intense scowling. Even the audience can notice a clear change in Guts' appearance just chapters apart.
25** During the same chapter, Casca is shown taking a fully-dressed shower under the waterfall and overall looks rather serene and maybe a little tired. But when she turns around to look at Guts, and the reader's point of view, the way she smiles makes it clear that this isn't the Casca from pre-Eclipse. She has gone insane from the preceeding events.
26* ''Manga/{{Bleach}}'': The Ninth Espada, Aaroniero Arruruerie attempts to trick Rukia by posing as her former mentor Kaien Shiba. He betrays himself by making a request that was blatantly uncharacteristic of Kaien, suggesting that she could earn his forgiveness by killing all her friends. Rukia, enraged, says Kaien would never say that even as a joke.
27* Lelouch on occasion in ''Anime/CodeGeass''. Rivalz and some of his other classmates notice that he's been acting strangely and avoiding them, but they'd never guess that the reason for it is that ''he's'' the masked rebel who's currently the biggest news topic of the day.
28* In ''Anime/DevilmanCrybaby'', after Akira Fudo becomes Devilman for the first time, his personality changes from a meek, kind-hearted young man who cries at news of deaths, to a debonair, devil-may-care badass who watches porn in his school's AV room with the volume cranked up without a care in the world.
29* Aside from [[MoreThanMindControl Ken]] during ''Anime/DigimonAdventure02'', the normally nice and affable Takeru has been known to become scarily angry when there is a threat to his Digimon and friends, as a result of witnessing the [[DeadSidekick death of his own Digimon]] in the first series. These angry moments have caused him to physically attack the then-Digimon Kaiser Ken ([[http://i75.photobucket.com/albums/i320/mpcp13/TakeruDarkAmusement.jpg while smiling in dark amusement at Ken's injury of his [Takeru's] face]]), advocate the killing of Dark Digimon, and deeply disturb [[FusionDance Jogress]] partner Iori on separate occasions.
30** Just to put this into context, Iori is TheStoic of the series. To freak him out would seem to be a very hard task... unless Takeru's pissed.
31* ''Anime/DragonBallZ'':
32** Goku, when he first goes Super Saiyan, goes from a peaceful, AllLovingHero, to a highly arrogant, cold-blooded, sadistic BloodKnight who wants to make Frieza suffer, physically and mentally. King Kai is outright frightened when he witnesses the change in Goku's personality.
33** Gohan during the Cell Games. Compare Gohan before he unlocks Super Saiyan 2 and after. Before [=SS2=] - a humble, soft-hearted MartialPacifist who makes it clear on more than one occasion that he doesn't like to hurt people, not even truly evil monsters like Cell. After [=SS2=] - an arrogant, borderline {{sadist}}ic, {{revenge}}-driven SmugSuper who eagerly beats Cell within an inch of his life and even deliberately prolongs the CurbStompBattle [[RevengeBeforeReason just because he wanted Cell to suffer as much as possible before he died]], even deliberately ignoring Goku ordering him to finish Cell off before he did something desperate. It takes Cell's imminent self-destruction, and Goku's semi-SenselessSacrifice to stop it, for him to snap out of it.
34* This usually sparks the plots in ''VisualNovel/HigurashiWhenTheyCry'', but one character stands out in particular: "The person who was there was not the Rika-chan I knew. It was another Furude Rika." Of course, the difference between Rika and the other examples is that [[spoiler:the "abnormal" personality is really her TrueSelf, her "normal" self is just ObfuscatingStupidity.]]
35* A frequent occurrence with Yuu from ''Manga/{{Holyland}}''. More experienced fighters are able to recognise when his heart is not properly in the fight, as his skill takes a corresponding drop.
36* A peculiar example from ''Anime/{{K}}'' - the Silver King Adolf K. Weismann has lived alone in an airship for decades with no contact with anyone. Blue King Reisi Munakata realize that something has been strange with him and that this should be investigated because the flight patterns of his airship change - he usually follows the optimal route based on the weather, but recently, he's been flying randomly. Since the night of the murder the characters have been investigating, actually. [[spoiler: Sure enough, he's been body-snatched.]]
37* Subverted with Hayasaka in ''Manga/KaguyaSamaLoveIsWar''. Post class trip [[spoiler:(now released from her service to the Shinomiya family), she behaves harsher and more distant in school, which is actually truer to how she usually behaves. Her GyaruGirl friends in school assume it's how she copes with [[MistakenForRomance having her heart broken by Shirogane]].]]
38* Episode 7 of ''Anime/KillLaKill'' has Ryuko noting how [[CloudCuckoolander Mako]] becomes less and less like her usual chipper self after becoming the Fight Club president. First she becomes increasingly formal and smug, and when she gets a Two-Star uniform, she is noticeably more brutal and doesn't even crack a smile.
39** Episode 21 has Ryuko behaving like a sociopath after [[spoiler:being brainwashed by her mother.]]
40* Subverted in ''Anime/MagicalProjectS'' while Misao certainly wasn't acting like herself when she tortured the main cast as the [[DarkMagicalGirl evil magical girl]] Pixy Misa (she wasn't even aware of her other side) it was revealed that it was in fact herself (the repressed aspects of her personality).
41* ''Manga/MariaNoDanzai'': {{Implied}}. Nozomu Okaya still acts like the same remorseless sociopath two years after Kiritaka's death, but during Kowase's breakdown as he tries to drown Yajima, he has Okaya in mind when demanding her to go back how she was. It may hint that although Okaya's demeanor may look the same, Kowase notices that his boss has changed in some way he doesn't seem to favor.
42* ''Anime/MyHime''. The anime is ambiguous about how much (if indeed at all) [[spoiler:the [=HiME=] star is affecting the [=HiME=] as it gets closer to earth. Is it playing with their emotions to provoke them to fight each other (thus causing Shizuru to go completely mad when she's rejected by Natsuki), or is it all a result of their normal psyches, just put under a lot of stress?]]
43** Interestingly enough, [[spoiler:immediately after being resurrected, Shizuru [[TearsOfRemorse starts crying]] and [[MyGodWhatHaveIDone apologizes to Natsuki]], which she had not done even in the moments before her death, after Natsuki kissed her and told her that she loved her, albeit in a different way. This suggests that she only came to her senses after being resurrected.]].
44* In an episode of ''[[Manga/NatsumesBookOfFriends Natsume Yuujinchou Shi]]'', Nyanko-sensei has to masquerade as Natsume after he's trapped in a bottle by a youkai. Nyanko-sensei then proceeds to act exactly as he usually does (read:a {{jerkass}}), much to Natsume's dismay.
45%%* Mimi in ''Anime/PerfectBlue'' throughout the majority of the movie. Also, Rumi towards the end.
46* The ''Manga/RanmaOneHalf'' {{filler}} episode "Am I Pretty? Ranma's Declaration of Womanhood" sees Ranma take a very nasty knock on the back of the head when he falls into the koi pond whilst escaping an angry Akane. When he regains consciousness, he's gone from a rough, brash, bluntly spoken macho boy to a soft-spoken, gentle, timid and pacifistic ''girl''. Fortunately, another blow to the head reverts him back to normal at the episode's end.
47%%* Utena after having lost a duel in ''Anime/RevolutionaryGirlUtena''.
48* In one ''Manga/ToLoveRu'' story, Haruna suddenly became an evil sadist, which was hilarious. It became HarsherInHindsight when the artist's wife, who Haruna's design was based on, turned out to be a crazy psychopath who kidnapped their daughter, among other demented things.
49** Rito in an extra chapter of the sequel ''To Love Ru Darkness''. Thanks to one of Momo's plants, he becomes a pervert and abuses Lala's inventions. He even agrees to the Harem Plan under its effects.
50* In the anime series ''Anime/TsukuyomiMoonPhase'', Hazuki has frequent periods of Not Himself, during which she "becomes" Miss Luna, a lustful, blood-thirsty vampire girl.
51[[/folder]]
52
53[[folder:Comic Books]]
54* ComicBook/CosmicBoy of DC's post-Zero Hour ''ComicBook/LegionOfSuperHeroes'' spent a whole {{Arc}} being Not Himself and alienating his teammates at every opportunity [[spoiler: in order to set up an elaborate EngineeredPublicConfession which revealed the President's corruption and caused her removal from office]]. Some Legion fans never forgave him for it. (It didn't help that this particular arc occurred in the first couple years after a total reboot of the Legion, so it wasn't as clear as it might have been that this wasn't just Cos's new personality.)
55* Apparently, hacking into Franchise/{{Superman}}'s mind is like evil hypnotists' [[WikiVandal wikivandalism]]. Some bratty six-year-old in Minneapolis trips over a ouija board, next thing you know our Man of Steel is giving the Batman a wedgie.
56** Supes has probably been brainwashed, hypnotized, or possessed more than any character in fiction. And if you count the times he's [[SuperDickery pretended]] to be Not Himself, more than all fictional characters combined. Read any random five Superman or Superman-associated comics from the 50s through the 70s, and see if you can't find one of these stories, or refer to [[http://www.superdickery.com/ here]] for the condensed version.
57** There's an arc in 2000 where Lois and Clark's marriage appeared to start falling apart, with Lois accusing Clark of not caring about her because she was just a human, and of cheating on her with Wonder Woman, effectively turning the poor guy into a miserable wreck and culminating in her walking out on him. Turns out it was actually Parasite masquerading as Lois in order to simultaneously feed off of Superman's powers and destroy his spirit in a plot to kill him. The arc wound up with what looked like a superpowered-Lois Lane beating the snot out of Superman right in front of a flabbergasted Perry White and Jimmy Olsen, and apparently required loads of explanations from the real Lois after everything was cleared up, especially as Parasite had been running around using Lois's know-how to steal millions of dollars.
58* One memorable Silver Age story did to ''Lois'' (who, believe it or not, could be almost as big on {{Superdickery}} as Superman himself back then). Specifically, a minor car accident gave her ''just'' enough brain damage to suddenly become a "ruthless female" that would try to blackmail Superman into marriage with photos proving his secret identity; this was supposedly a line the "real" Lois would never cross, though DependingOnTheWriter she's done worse even in her ''right'' mind.
59* In the ''ComicBook/JusticeLeagueInternational'' comic, Guy Gardner spends a rather extended period like this after minor head trauma. The abrasive, chauvinistic, arrogant Guy turns into a sweet, Sensitive Guy -- who really exists deep down, as exhibited when Guy falls in love. This trope is partially subverted, though, because the League ''likes him better as Sensitive Guy'' and therefore makes no effort to return him to his previous state.
60* During the "Trinity" arc, it is revealed that Franchise/{{Superman}}, Franchise/{{Batman}} and Franchise/WonderWoman are "Keystones" of reality, inherent to the fabric of the universe, and that the endless Expies of them across the multiverse are the "Keystones" of their universe (including [[ComicBook/TheAuthority Apollo, Midnighter]] and [[ComicBook/WildCATsWildStorm Zealot]] for the Creator/{{Wildstorm}} universe, whch makes... [[{{Grimdark}} a lot]] [[NinetiesAntihero of sense]]). When a trio of villains tries to usurp their position for ultimate power, the spell they use has the side effect of of causing them to take on each others personality traits, meaning on a mission to the MirrorUniverse, Superman goes LeeroyJenkins and [[CurbStompBattle Curb Stomps]] the [[EvilTwin CSA]] while Batman tries to negotiate a peaceful solution and Wonder Woman broods on their out of character behaviour. Then when Superman sends Ultraman, Owlman and Superwoman out of their universe, it starts trying to force them to become the new Keystones, and they start acting like their CSA doubles as well as each other. Fortunately ComicBook/BlackCanary tells them to go home and get their act together.
61* ''ComicBook/SonicTheHedgehogArchieComics'': After the TimeSkip, Antoine inexplicably became an insufferable JerkAss. Writer Karl Bollers wanted to write this off as natural character growth, but fellow writer Ken Penders decided he [[ArmedWithCanon didn't like that idea]], so he changed to Antoine having been switched with his EvilTwin from an AlternateUniverse. And about the time of that reveal, Sonic's own twin from that same AU switched places with him as well, so the other Freedom Fighters had to deal with "Sonic" acting out of character too.
62* In ''ComicBook/BillyBatsonAndTheMagicOfShazam,'' [[OlderAlterEgo Captain Marvel]] spends the ninth issue acting like a jerk to everyone, and also refuses to [[HenshinHero change back]] into Billy; when this culminates in him [[spoiler:leaving the Arson Fiend in a burning building]], [[{{Sidekick}} Mary]] forces him to turn back, and [[KidHero Billy]] immediately reports feeling like he had no control over his body for the last few days. He resolves to not change until they figure out why, but by the next issue, ''he's'' starting to act nastier too, and turns into a BloodKnight when fighting the VillainOfTheWeek. It eventually turns out that [[spoiler:he's being corrupted from within by [[StarfishAliens Mr. Mind]]]].
63* In ''ComicBook/TheTransformersRobotsInDisguise'', [[spoiler:Prowl]] is expecting this trope to tip off the rest of the Autobots that he is being mind-controlled by the Decepticons. He is shocked when they respond that, no, they think he is a callous {{Jerkass}} who would be willing to throw a friend's life away for the sake of his plan when he ''isn't'' being mind-controlled and therefore hadn't noticed a difference in his behavior.
64* ''ComicBook/WonderWoman1987'': To their identical twin sister Serva the switch from being a considering, careful person in private to a sadistic villain after surviving a gunshot to the head is a huge change for Hypnota, and unfortunately one that seems permanent. The public don't notice as Hypnota and Serva have always presented a different persona to the public as a part of maintaining their stage magic act.
65* ''ComicBook/XMen:'' Toward the end of Chris Claremont's first run, normally motherly scientist Moira [=MacTaggert=] suddenly becomes much more bad-tempered and vicious, along with discarding her normal wardrobe for hanging around the lab in crop-tops and panties. Her boyfriend Banshee immediately pegs something as being incredibly wrong. She's being controlled by the Shadow King.
66* This is what's going on in the ''ComicBook/BatmanChipZdarsky'' run, especially ''ComicBook/TheGothamWar''. As established in ''ComicBook/BatmanGrantMorrison'', Batman made a backup personality known as "Zur-En-Arrh" to be used should something attack Batman in a way to disable him. However, the stress of numerous events has caused Bruce's mental bindings on Zur-En-Arrh to come loose and he's gotten his claws on Bruce's brain.
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69[[folder:Fan Works]]
70* ''Fanfic/AbraxasHrodvitnon'': In this ''Film/GodzillaKingOfTheMonsters2019'' fanfiction, Alan Jonah and half of his paramilitary slowly begin exhibiting this due to exposure to San's original head's psychic BrownNote. Jonah in particular one day decides to not only perform a violent napalm experiment on [[TwoBeingsOneBody San and Vivienne]], he goes out of his way to savagely rip Vivienne apart with words, and it doesn't go unnoticed by Vivienne later on that the infamous EcoTerrorist is behaving quite contrary to his normal, cold-hearted self. Tejada also says Kauffmann used to be "like an open book" but changed after he was affected.
71* ''Fanfic/AllAssortedAnimorphsAUs'': Inverted in "What if they saved Jake's family?". Tom is upset that his parents don't understand why he's been acting strange since his [[PuppeteerParasite Yeerk]] left him; they think Tom's ''true'' self is the changeling.
72* ''[[Fanfic/BurnTheWitchMiraculousLadybug BURN THE WITCH]]'': Tikki gets swept up in Witch Hunter's influence, encouraging Marinette to prioritize saving the city over protecting [[LiarRevealed Lila]] from the mob. This is partly due to her having experience with past witch hunts, and feeling no small amount of satisfaction at the thought of [[AssholeVictim somebody who actually]] ''[[AssholeVictim DESERVES]]'' [[AssholeVictim to suffer]] being the target this time, as well as wanting to protect Marinette from being hurt any further by [[ManipulativeBitch Lila's manipulations]].
73** This gets used for a painful little twist of DramaticIrony when Tikki tries to reassure Marinette that [[GuiltComplex she's not responsible]] for the harm Lila has caused. Marinette is so used to Tikki constantly encouraging her to be an IdealHero that she assumes Tikki would ''never'' comfort her in such a fashion.
74* The [[MutagenicGoo ponification potion]] in many ''[[Fanfic/TheConversionBureau Conversion Bureau]]'' stories often have this effect. In turning humans into ponies, some personality changes ensue. [[DeconstructionFic The deconstructions]] don't shy away from showing how this can be [[GettingSmiliesPaintedOnYourSoul utterly messed up and frightening]].
75** In ''Fanfic/TheConversionBureauNotAlone'', one of the main human characters laments how much his friend Eddy changed after taking the potion, going so far as to call Eddy's pony self a "pleasant smiling zombie with wings." The chapter "Aftermath Part 1" reveals why - basically [[spoiler: the human convert's original personality is completely erased and overwritten by a new one provided by the potion. However, they still retain their memories, basically fooling them into thinking they're the same person who drank it]].
76** ''FanFic/TheConversionBureauTheOtherSideOfTheSpectrum'' takes it further, where the potion completely destroys the victim's original personality, effectively killing them. The chapter "War March and Past Sins" explains how - [[spoiler: basically the human convert's soul is ''shattered to pieces'' and then "bound in chains" to Queen Celestia and the Bag of Tirek's will. Even worse, according to the Elder Shaman of the Zebras, it is completely impossible to repair those souls with any medicine or magic; only {{Mercy Kill}}ing them will make their souls whole again and set them free]]. To quote one ex-HLF member:
77--->'''Andrew Silas''': "We expected them to just be our friends and family with hooves and fur, we expected... I don't know what. The simplest way I can put it is that we expected it to be them. That they'd be something like the people we knew. Henry, though - you've heard this description a million times, but it just wasn't him in there."
78* ''Fanfic/ADelicateBalance'': [[WesternAnimation/MyLittlePonyFriendshipIsMagic Pinkie Pie]] immediately realizes that Twilight has something on her mind when Twilight fails to be an utter perfectionist when decorating cupcakes.
79* In the ''Manga/{{Bleach}}'' fanfic series ''Fanfic/{{Heirverse}}'', Aizen usually when [[spoiler: Jac is getting to him or more rarely if he's emotional. Gin begins to figure this out after ''CF''.]]
80* In ''Fanfic/{{Intercom}}'', this is how Riley's parents and friends know that something is wrong. It starts with Riley acting quieter than usual, then she begins to get disinterested and detached from the world, and becomes prone to violent outbursts. [[HearingVoices Meeting your emotions]] [[LossOfIdentity will do that to you.]]
81* In ''Fanfic/TheKeysStandAlone: The Soft World'', everyone notices that Ringo is getting a little strange and obsessed while they're at the Guardians. They assume he's going nuts because he's unable to use his mindsight while he's under the Guardians' city mask. Although this is partially true, John figures out (to his horror) that the psionics among the Guardians [[MoreThanMindControl have been subtly working on Ringo to ensure that he wants to stay with them]]. It takes [[WhamEpisode a rather shocking moment for Ringo to snap out of it]].
82* Barbara Gordon in ''[[https://www.fanfiction.net/s/13131858/6/A-Little-Less-Conversation-a-Little-More-Action-Please A Little Less Conversation, a Little More Action Please]]'' temporarily becomes a DrillSergeantNasty to both Cassandra Cain and Stephanie Brown due to a number of extenuating circumstances leaving her incredibly stressed out: barely surviving the [[WesternAnimation/JusticeLeague Imperium Invasion]], believing that all her friends are dead during said invasion, deciding to reconnect with Dick only to find Starfire wearing one of his shirts, and Batman unceremoniously dropping Cassandra and Stephanie on her to train. All things combined lead to her running Stephanie through a ''brutal'' exercises regimen and screaming at Cassandra for not reading a set of files, not knowing the girl can't read.
83* In ''Fanfic/MegaManDefenderOfTheHumanRace'', [=ProtoMan=] is this post episode 10; the other characters begin to notice midway through episode 11.
84* ''Fanfic/MyImmortal'': The only reason Dumbledore swore was because he had a ''headache'', okay? (Of course, he then swears regularly for the remainder of the "text".)
85* In the ''Series/{{Star Trek|The Original Series}}'' fanfic ''Fanfic/{{Retribution}}'', Spock convinces Kirk to forgive himself for [[Recap/StarTrekS2E12TheDeadlyYears his harsh words]] by forcing him to admit that the RapidAging was affecting his mind.
86* In ''Fanfic/ThoseWhoStandForNothingFallForAnything'' Takada regularly excuses Light's irritabile moods by telling everyone he has a headache.
87* In the Music/Devo web-comic, "Tired O' Tourin'," Mark gets attacked by several stingrays after falling into a river that was infested with them. After that, the venom causes him to act a bit...different. He turns the bus into a low-rider, wears clothes from the Gap, listens to American Top 40, and [[BatmanGrabsAGun threatens the rest of the band (one of whom is his brother) with a gun]]. Luckily, General Boy puts a stop to his behaviour and he is quite horrified with his antics after going back to normal.
88* {{Discussed}} and {{Defied}} in ''FanFic/TyrantlyEverAfter''; Artina tries reassuring [[TheAtoner Nemo]] that he wasn't himself during the worst of his actions, as he was [[spoiler:[[VillainOverride possessed]] during the final battle]]. Nemo rejects her, pointing out that he spent literal ''centuries'' pursuing his vengeful plans following his StartOfDarkness.
89-->'''Nemo:''' "'Myself?' I spent so many centuries like that, who's to say that's not the real me now...?"
90* "[[https://www.youtube.com/watch?v=VDL9ujTrAQE We Didn't Stop With Hydra]]" (a [[WeDidntStartTheBillyJoelParodies Billy Joel parody]] listing Film/MarvelCinematicUniverse antagonists) includes "[[Film/TheAvengers2012 Clint and Selvig (Not Themselves)]]."
91* ''[[Fanfic/TheZeroContextSeries Zero Context: Taking Out the Trash]]'': When the main protagonists receive unexpected invitations to the wedding of "Circe and Marc Maddhouse", this immediately puts them on high alert: not only was the Circe they knew not involved in any romantic endeavors, let alone with a morally bankrupt sleazeball, she was an admitted lesbian--and thus had absolutely zero romantic interest in men. After the situation was resolved, [[spoiler:Circe confirmed that their judgments were spot on: Marc had manipulated her into drinking one of her own [[LovePotion love potions]], ensuring that she would see him as the perfect spouse for her.]]
92[[/folder]]
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94[[folder:Films — Animation]]
95* In the movie ''WesternAnimation/AlvinAndTheChipmunksMeetTheWolfman'', after he gets bitten by the Wolfman, Theodore became very strong and cool during the day, but also arrogant and aggressive. To point that Eleanor asks if he and Alvin have a FreakyFridayFlip.
96* In ''WesternAnimation/BatmanReturnOfTheCapedCrusaders'', Batman is fairly happy and works with the police, fitting the 60's TV show that the movie's based on. When he's BrainwashedAndCrazy, he pulls off a StealthHiBye on the commissioner like most other versions of the character, making everyone present realize that something is wrong with him.
97* In ''WesternAnimation/MyLittlePonyEquestriaGirlsRainbowRocks'', the Canterlot High School students under the Dazzlings' spell become confrontational and ultra-competitive. It's most notable with Flash Sentry, for whom it's completely at odds with his NiceGuy persona from the first movie; he turns against the Rainbooms once they enter the battle of the bands because they're competing against each other now, he even snaps once at Twilight Sparkle, making her cry.
98* In ''WesternAnimation/SupermanBatmanPublicEnemies'', after Luthor, who has been elected President and framed Superman for murder, placed a bounty on Supes' head. The first to come after him and Batman are Mongul and Solomon Grundy. Superman first realizes something is off because Mongul is primarily interested in intergalactic domination, so he would have no real desire for money, also the fact that he never says a word during his fight with Superman when he's typically prone to EvilGloating. Batman, meanwhile, is facing off with the [[HulkSpeak normally inarticulate]] Grundy, but this time is "sounding like William F. Buckley." Batman and Superman begin to wonder if maybe they were both being controlled by a telepath. They end up being right. Gorilla Grodd was controlling them.
99* A [[TearJerker tearjerking]] example occurs in ''WesternAnimation/WallE'': [[spoiler: EVE repairs WALL•E after he's been crushed to death. However, once he's started up again, WALL•E has no memories of EVE, and his personality is gone. He's just another trash-compacting robot. EVE especially notices he's not himself when he regards all the trinkets he's collected over the centuries as just more trash, and is completely indifferent to the cockroach he adopted as a pet.]] Fortunately, [[spoiler:he gets better]].
100[[/folder]]
101
102[[folder:Films — Live-Action]]
103* ''Film/TheBrainStealers'' has Li Yuan-Ming, the son of esteemed scientist Dr. Li, being captured by the main villain, Professor Zero, and subjected to having his mind swapped with Zero's henchman, Peter, who intends to infiltrate the Li's household. But Peter's mannerisms and attitude - that he's a jovial, happy-go-lucky jokester most of the time, but remains quiet throughout - ticks off his family that something is amiss. His flimsy excuse of "I'm jetlagged after flying from Tokyo" fails to convince his sister and the film's heroine Li Chiu-Lan, who later uncovers his true identity.
104* Inverted in ''Literature/DangerousLiaisons'', when the Vicomte Sébastien de Valmont, known to be a ruthless, womanizing manipulator, genuinely falls in love with Madame Marie de Tourvel. He is forced into the situation by Marquise Isabelle de Merteuil, and with tears in his eyes has to push away the woman he loves through cruel manipulation. She is aware that it's [[OutOfCharacterAlert odd for the Vicomte to speak thus to her]], but is heartbroken nonetheless.
105* In ''Film/EveryoneSaysILoveYou'', one of the characters becomes a Republican to the great surprise (and dismay) of his family. It turns out it was because of some sort of brain problem.
106* Definitely seen a lot in ''Film/FaceOff'', when plastic surgery for an undercover operation results in Sean Archer (Creator/JohnTravolta) getting the face of Castor Troy (Creator/NicolasCage), and subsequently, Castor retaliates upon finding out his face has been stolen by stealing Archer's face for himself. By having Cage and Travolta swap roles, one sees how the two characters react differently when in the company of the other's inner circle. One contrast is how they take victory celebrations: when Archer gets his for putting Castor into a coma, he looks depressed and turns down a bottle of champagne, then decides to remind them of the agents killed by Castor in the shootout. When Castor is being congratulated for "locating" and disarming his own bomb, he wears his sunglasses and seems unusually chipper. Elsewhere, when Castor gets his first glimpse of Archer's daughter Jamie, he inadvertently calls her "Janie", and also lights up a cigarette, two things the real Archer would never do, but which are glossed over.
107%%* Quite a lot of this in ''Film/{{Fallen}}'': "I wanna tell you about the time I almost died..."
108* ''Literature/HarryPotter'':
109** In ''Literature/HarryPotterAndTheChamberOfSecrets'', Tom Riddle, through his diary, possesses Ginny Weasley to commit atrocities for him. It's stated several times that not only could she not fight him, she wasn't even aware of what he was doing while in control of her body and was unable to recall those events even after the fact. It wasn't until she realized her memory gaps coincided with the attacks that she started to put it together, but by then it was too late.
110** This is also implied to be what happens to people placed under the Imperius Curse. Unfortunately, as [[spoiler:fake]] Moody explains in ''Literature/HarryPotterAndTheGobletOfFire'', there's no way to tell after the fact whether someone had actually been a victim of the curse, making it quite difficult for the Ministry to tell the difference between those who had been truly Imperiused and those who were falsely claiming it as a defense.
111[[/folder]]
112
113[[folder:Literature]]
114* In ''Literature/{{Animorphs}},'' the fact that Earth is being invaded by {{Puppeteer Parasite}}s means that this trope is kind of inevitable. Most Yeerks, having access to their hosts' memories, can pass very well, but Tom's first Yeerk, Temrash, was an especially BadLiar. He quit the basketball team, which was Tom's biggest passion, and generally started acting very out of character. Upon discovering that Yeerks existed, [[DeadpanSnarker Marco]] only needed one conversation with "Tom" to realize that he was infested. That same Yeerk later got put in [[TheLeader Jake]], but his [[FantasticRacism contempt for Andalites]] was so apparent that one glance at [[TokenNonHuman Ax]] made the latter suspect him.
115* In the Creator/VCAndrews novel ''April Shadows'', April's father starts to act like a {{jerkass}} to his family for seemingly no reason. [[spoiler:The reason turns out to be that he found out he had terminal cancer and he didn't want his family to feel sad for him when he died. So, he decides to make them hate him. Once his wife and daughters find out, though, they feel sorry for him anyway.]]
116* Ditzy but loyal ''Literature/BetsyTheVampireQueen'' becomes a real bitch after reading too many pages of the [[GreatBigBookOfEverything Book of the Dead]] in a row in ''Undead and Unappreciated''.
117%%* In ''Literature/EmilyTheStrangeTheLostDays'', Earwig knows she is not Molly, and Molly's parents know she is not their daughter for various reasons.
118* In the ''Literature/ErebusSequence'', Dino notes that both [[spoiler:Anea and Russo]] are acting strangely harsh and distant. It turns out that they're both using a ''tinctura'' which, presumably without their knowledge, strips away people's empathy and sentiment.
119* In ''Literature/TheHeroesOfOlympus'', Leo suddenly starts firing the ''Argo II'''s weapons at Camp Jupiter, forcing the ship to leave and increasing tensions between the demigods. Afterwards he admits that while he can remember doing it, he can't explain why and [[EvilIsDeathlyCold felt a cold sensation]] while it happened. (Prior to this, he had also flashed an evil smile that Annabeth noticed but wrote off as her imagination.) Later Percy and Jason also start trying to kill each other. They all turn out to be [[DemonicPossession possessed]] by spirits called eidolons, which can influence people without their being aware of it.
120* ''Literature/{{Hurog}}'': In ''Dragon Bones'':
121** One of Ward's allies tries to stab him. They later find out that [[spoiler:the man was magically controlled by the ''real'' traitor. He gets to apologize and be forgiven before he dies.]]
122** There's also the creepy moment when the CuteMute girl suddenly speaks — with a male voice, no less. [[spoiler: It turns out she's possessed by a god, who is not actually ''evil'', but GoodIsNotNice and he's rather impolite.]]
123* ''Literature/{{Inkmistress}}'': After she's [[TwoBeingsOneBody fused with a dragon]], Ina abruptly becomes ruthless and bloodthirsty, slaughtering the bandits who'd murdered her family with relish then sets off to kill the king too whom she blames for allowing this. Her lover Asra is horrifies and doesn't recognize her, trying to stop Ina's plan. [[spoiler:However, it turns out that Ina was always far more cold and self-interested than Asra ever [[LovingAShadow really knew]] earlier.]]
124* In L. Jagi Lamplighter's ''[[Literature/ProsperosDaughter Prospero in Hell]]'', Miranda admits that she had not noticed that Mab had been replaced with a shapeshifter, just that he was acting oddly.
125* Marianne Dashwood in ''Literature/SenseAndSensibility''. After she is jilted by her first love, she falls into a despair and eventually, after months of barely eating or sleeping, she stays out for hours in a rainstorm while insufficiently wrapped up. She nearly dies of fever or has a bad flu, but when she recovers she has suddenly gained about five years' worth of emotional maturity, and not long afterward marries someone much older than herself. Marianne is passionate and talented and struggles to conform to what her society expects of a young unmarried woman. It feels as though Austen is building up to tragically killing her off... but at the last minute she backs off, and Marianne is suddenly able to deal with the pressures of hiding her feelings in the public space.
126* ''Franchise/StarWarsLegends'': After Tash is injected [[spoiler: with TheVirus]] in ''Literature/GalaxyOfFear: The Planet Plague'', she develops a rash, then a growing bump, and acts increasingly more irritable and angry than is usual for her. She was showing some signs before the injection, but they got worse after it. Turns out that anger makes the disease progress more quickly [[spoiler: and speeding her transformation into a BlobMonster]] - when she made herself calm down and embrace more positive emotions, it helped.
127* In the young adult novel ''Stranger With My Face'' by Creator/LoisDuncan, protagonist Laurie discovers that she was adopted as an infant and has an identical SeparatedAtBirth twin, Lia. Lia has mastered astral projection and uses it to form a bond with Laurie. She teaches Laurie to do likewise, but it's a ruse to trick Laurie out of her body so Lia can possess it. Laurie is left in a ghostlike state, watching her body operate under her twin's power. The only people who notice that anything's amiss are her adoptive little sister, who spots that Laurie is acting out of character, and Laurie's boyfriend, who knows the whole story and suspects that Lia might have done exactly what she did.
128%%* In ''Literature/ThoseThatWake'', [[spoiler:Brath]] is this once the heroes are trapped in the forest.
129* In ''Literature/TheWheelOfTime'', magic-users can be forcibly turned to serve the Dark One if they're captured and put through a specific ritual. Afterwards, they will mostly behave the same, other than subtly pursuing the Shadow's interests, but those who know them well can recognize small changes in their mannerisms, and will recognize [[EyesNeverLie something wrong about their eyes]].
130[[/folder]]
131
132[[folder:Live-Action TV]]
133* ''Series/ThirdRockFromTheSun'' had an episode where orders come through that Dick is to be replaced as mission commander. After the replacement shows up (looking exactly like Dick, and imprisons Dick instead of sending him home) an emergency message comes through that the previous orders were faked and the 'replacement' is actually a renegade who wants to conquer Earth. Unfortunately, the only people around when the warning comes through are New Dick and Harry (who channels the messages and thus can't actually hear them). Much hilarity ensues until the problem is corrected.
134* ''Series/AmazingStories2020'': In "[[Recap/AmazingStories2020SignsOfLife Signs Of Life]]" Alia and the audience quickly learn Sara is definitely different from the woman she'd once been, not even remembering that Alia's her daughter. She's now involved with a strange man named Wayne who is up to mysterious business, and has peculiar abilities. It turns out she's not actually Sara, but an alien inhabiting her body.
135* ''Series/{{Angel}}'':
136** Season 2 has Angel uncharacteristically hateful.
137** In Season 4, Cordy isn't herself after being possessed.
138** The end of season 5 has Angel as a FakeDefector in order to stop the Apocalypse. [[SuperDickery The audience isn't immediately aware of this, though]].
139* In ''Series/BabylonFive'', Michael Garibaldi spends most of season 4 acting strange and distancing himself from the rest of the crew. It turns out [[spoiler:his mind had been programmed to act this way by telepath Bester, who used him to infiltrate an anti-telepath conspiracy. [[MoreThanMindControl Betraying Babylon 5 and Sheridan was an unexpected bonus]]]]. Interestingly, it's revealed that his personality wasn't actually altered. Instead, [[ShadowArchetype the darker aspects of his personality]] were intensified, making him even more paranoid and suspicious of authority than normal.
140* ''Series/{{Being Human|UK}}'': When Mitchell is undergoing some SanitySlippage at the end of season two, he starts hitting on Annie and makes her incredibly uncomfortable. Annie runs into the other room and tells George "There's someone in there." George is initially confused as to why she didn't just say "Mitchell" but it becomes clear quite quickly that Mitchell is, in fact, very much Not Himself.
141* ''Series/BuffyTheVampireSlayer'':
142** Buffy. She does this even more than [[SplitPersonality Angel.]] Whether it be a spell going wrong and making her fall in love with Spike or the way she cracks under the pressure makes the fans crack at her attitude whether or not the Slayer is herself is, quite literally, largely dependent on how her [[ImportantHaircut hair]] is that week.
143** Tara suddenly acting violently homophobic towards her girlfriend, coupled with Buffy and Riley disregarding everyone and everything around them to engage in CoitusUninterruptus, clue the Scoobies in as to the nature of what they are dealing with in "[[Recap/BuffyTheVampireSlayerS4E18WhereTheWildThingsAre Where The Wild Things Are]]".
144* Basically any ''Series/{{Charmed|1998}}'' episode that focused on possession or the sisters being [[TheCorruption corrupted]] somehow; it's happened to each sister at least once (and to all three at once in at least one episode), let alone their love interests and the supporting cast.
145* ''Series/{{Chuck}}'':
146** Chuck realizes something is deeply wrong with Morgan after he gets the Intersect when his best friend and lifelong geek has absolutely no interest in a ''Die Hard'' marathon and barely knows anything about ''Star Wars''.
147** The penultimate episode sees Chuck realizing that something is deeply wrong when a Sarah gets snappish over a massage and then turns away from him in bed at night. He convinces himself that it's just the result of her traumatic escape from Quinn, but he can't explain [[spoiler:what she's doing with the Intersect glasses in her bag]]. Turns out [[spoiler:Sarah has been mind-wiped.]]
148* ''Series/{{Community}}'' - on Abed's birthday, Jeff meets him at a fancy restaurant, meaning to divert him to a ''Pulp Fiction'' themed party his friends have arranged, but finds him acting oddly sociable and claiming to be over pop culture. [[spoiler:It turns out he's just 'doing' another movie scenario, ''My Dinner with Andre''.]]
149* ''Series/DoctorWho'':
150** [[Recap/DoctorWhoS15E6TheInvasionofTime "The Invasion of Time"]]: The Doctor is initiated as Lord President of Gallifrey and begins acting very cold and megalomaniacal, contrary to his usual jolly and playful personality.
151** [[Recap/DoctorWhoS28E1NewEarth "New Earth"]]: Lady Cassandra [[GrandTheftMe possesses]] Rose, and then attempts to act like her to fool the Doctor. He can tell something's not right because Rose would care about the clones that are being experimented on for cures, and Cassandra doesn't.
152** [[Recap/DoctorWhoS30E5ThePoisonSky "The Poison Sky"]]: Similarly to the Cassandra-and-Rose example, it's a no-brainer for the Doctor that he's talking to a ruthless, evil copy, and not the real, caring Martha, he just pretends not to know because it suits his own purposes. Somehow she never notices the disgusted faces he makes.
153* ''Series/{{Farscape}}'':
154** On one occasion it becomes clear that it's not really Aeryn when she doesn't know [[spoiler: she's pregnant]], once when she suggests abandoning their friends, and once when she's suspiciously happy: "Aeryn smiling for no reason. That ought to have been our first clue."
155** Another one occurs when Harvey takes over Crichton at the end of Season 2 and [[spoiler: forces John to kill Aeryn]].
156* ''Series/GetSmart'': [[GeniusDitz Maxwell Smart]] is attempting to infiltrate a KAOS group, and as such needs to dramatically burn all his bridges with CONTROL. Of course, this being ''Get Smart'', it [[HilarityEnsues doesn't work quite as planned]].
157* Duncan under the Dark Quickening in ''Series/{{Highlander}}: The Series''.
158* ''Series/{{House}}'': At the end of one episode that deals with a sociopathic patient, the patient tells her husband (who had only just found out about her sociopathy) that she never loved him and never wants to see him again. This leads House to realize he was correct in believing that the symptoms for which she was hospitalized were caused by an underlying condition that also caused her sociopathy. He calls her out on the fact that she had nothing to gain by leaving her husband, as she had only married him for his money in the first place. She had actually said what she said because her newly discovered conscience wouldn't allow her to keep using him, whereas if the treatment had not cured her of her sociopathy, she would have pretended otherwise in order to keep him around.
159* On ''Series/HouseOfAnubis'', when Fabian and Alfie become sinners, everyone is scared because they are acting like total jerks, when in reality they are two of the nicest people in the house.
160* On an episode of ''Series/{{Kojak}}'', Lt. Kojak appears to go corrupt, but of course in the end it's all a [[FakeDefector big undercover operation]].
161* ''Series/{{Lost}}'':
162** In season 5, after returning to the Island Locke is not himself, acting more determined and secretive than ever and knowing things he can't possibly know. Because [[spoiler:he's still dead and The Man in Black is in his place.]]
163** In season 6, [[spoiler:Sayid and Claire have been infected with The Sickness, and are now evil recruits of The Man in Black]].
164* ''Series/MotherlandFortSalem'': Abigail and Raelle start up a violent argument that leads to a physical fight (Scylla gets involved as well) in "Delusional", which quickly indicates the effect of another spell, as it's completely against their usual dynamic.
165* ''Series/NewsRadio'':
166** Matthew punched out Bill after one of Bill's pranks went too far. Somehow, the two [[PersonalitySwap switch personalities]] - Bill becomes submissive, while Matthew starts acting like the office alpha male. An accidental slap from Bill reverses the effect, and the two return to normal.
167** In a later episode, Matthew suffers a mid-life crisis after turning 30 and starts acting like a '70s-era British punk.
168* ''Series/TheOfficeUS'': assistant manager (or assistant to the manager) Dwight Schrute, a pompous, anti-social jerk, inexplicably starts acting nice to everyone. Later it is discovered to be the effect of a concussion Dwight suffered as a result of a car crash earlier in the episode.
169* ''Series/TheOutpost'':
170** After being conditioned through drugs, psychological manipulation and trickery [[spoiler:Garret]] is a completely different man-fanatically loyal to the Prime Order, hateful of Gwynn and expressing violent bigotry toward Blackbloods (the opposite from his previous attitudes).
171** Gwen acting much more upbeat and friendly than usual tips off Talon that something is amiss (not that she isn't affectionate, but in a more reserved way). Wren also realizes this about her mother Yavalla, who hugs her (this is something normally she never does).
172* ''Series/ResidentAlien'': Isabelle, Harry's wife, is very aware that her husband's acting really strangely. Naturally though she doesn't realize this is because he's dead, and "Harry" is an alien imposter.
173* ''Series/{{Smallville}}'' has its fair share of Not Himself episodes, thanks to Red Kryptonite and the truly absurd number of villains who have possession abilities.
174* ''Franchise/{{Stargate|Verse}}'':
175** Happens a lot in ''Series/StargateSG1''. Between the Goa'uld, mind control, robots, clones, and other random behavior changes, the characters get a pretty good taste of this.
176*** One example stands out because it required no {{Phlebotinum}}. Jack starts acting even more anti-authoritarian than normal, to the point of actual insubordination. He even steals alien technology he was told he couldn't have, nearly sparking a war with one of Earth's allies. [[spoiler:It turns out it was all an act. He was pretending to be dissatisfied with the SGC's methods so that he would get recruited by a shadow organization that had been stealing alien artifacts. The aliens Jack stole from were the ones who alerted the SGC and were in on the plan, neatly avoiding the whole Interstellar Incident thing.]]
177** ''Series/StargateAtlantis'':
178*** The audience gradually realizes that Sheppard is Not Himself after being fed on by a Wraith/human hybrid when he A) beats Ronon in a race, B) beats Teyla in a fight, C) asks Teyla to call him "John", and D) kisses Teyla. He realizes something is up himself after the last one.
179*** The characters get pretty good at spotting it too; in fact, standard SG training involves numerous scenarios that involve teammates possibly being compromised by a Goa'uld.
180* ''Series/StarTrekTheNextGeneration'':
181** Data, relatively often, usually when he's possessed by one thing or another, or something's going weird in his programming.
182** Geordi [=LaForge=] gets one of these in the episode "[[Recap/StarTrekTheNextGenerationS4E24TheMindsEye The Mind's Eye]]". The most disturbing thing about it being that aside from his being brainwashed and attempting to murder someone in full view, he behaves entirely and utterly ''like'' himself.
183* ''Series/StarTrekTheOriginalSeries'': In the episode "[[Recap/StarTrekS2E1AmokTime Amok Time]]", Spock's uncharacteristic emotional outbursts are the first clue that something is [[MateOrDie seriously wrong with him]].
184* ''Series/StarTrekDeepSpaceNine'':
185** In "[[Recap/StarTrekDeepSpaceNineS01E18DramatisPersonae Dramatis Personae]]", a disagreement between Sisko and Kira rapidly turns into a multi-faction cold war running across the station. It turns out that telepathic artifacts from a dead world are causing the regular characters to recreate the power struggle that destroyed that civilization.
186** In "[[Recap/StarTrekDeepSpaceNineS02E25Tribunal Tribunal]]", Chief O'Brien is put on trial by the Cardassians for aiding the Maquis. O'Brien had been set up by Boone, a former crewmate of his. Investigating further, Sisko and Bashir note how Boone went from a model Starfleet officer to a malcontent kicked out for bad behavior and cutting off all contact with his family. His ex-wife wrote it up to him affected by being held prisoner by the Cardassians. But Bashir does a medical scan that shows "Boone" is actually a disguised Cardassian who took the place of the real Boone, who died in captivity.
187* ''Series/{{Supernatural}}'':
188** Sam throughout season 4 when he was [[spoiler: a demon-blood junkie]] and in the first half of season 6 because he [[spoiler: [[CameBackWrong came back as]] [[TheSoulless The Soulless]]]] causing him to show classic sociopathic behavior as a result.
189** Dean in the back half of season 9 and most of season 10 due to [[spoiler: the effects of the Mark of Cain]].
190** Castiel, four times: at the end of season 4 where he was brainwashed, before Dean snaps him out of it. Then at the start of season 7, when the souls [[spoiler: and [[EldritchAbomination leviathans]]]] that he's absorbed in the season 6 finale start to mess with his mind. Then in season 8 when he is taken out of Purgatory and brainwashed by Naomi to serve as a ManchurianAgent without him realizing it and again in season 11, this time because he is possessed by Lucifer who is impersonating Cas when around the Winchester brothers.
191* ''Series/TeenWolf'':
192** Jackson becoming creepily pleasant, albeit increasingly unstable. Allison takes notice.
193** A full moon seems to make Scott meaner.
194%%* This happens to almost every member of Torchwood in the ''Series/{{Torchwood}}'' episode "Adam". Especially Owen.
195* ''Series/TwinPeaks'' ended with a Not Himself, presumably to have been the plot of the cancelled third season. "How's Annie? How's Annie? How's Annie?!"
196* ''Series/TheXFiles'':
197** In "[[Recap/TheXFilesS04E20SmallPotatoes Small Potatoes]]", which involves a ShapeshiftingSeducer, and in "[[Recap/TheXFilesS06E04Dreamland Dreamland]]", in which Mulder switches bodies with an Area51 worker, both Non-Mulders try their hand at seducing Scully.
198** In "[[Recap/TheXFilesS01E08Ice Ice]]", parasitic organisms cause hosts to act aggressively. "We are not who we are."
199** Some crazy planetary and geological vortex in "[[Recap/TheXFilesS03E13Syzygy Syzygy]]" makes everyone behave weirdly and out of character. Even Mulder and Scully.
200** In "[[Recap/TheXFilesS07E20FightClub Fight Club]]", Mulder and Scully beat each other very nastily because they encounter two doppelgängerish half-sisters in whose presence everybody gets extremely violent.
201[[/folder]]
202
203[[folder:Music]]
204* The Brandi Carlisle song "That Wasn't Me" is about how addiction can change how a person acts and cause them to hurt the ones they love and do things they're shamed of. WordOfGod says the song was inspired by a friend's battle with addiction.
205-->"Whatever you've seen/That wasn't me".
206[[/folder]]
207
208[[folder:Podcasts]]
209* Dr. Lancaster from ''Podcast/FindUsAlive'' is ordinarily upbeat, supportive, and selfless, befitting of his position as Head Psychiatrist. However, after [[spoiler: a Dash Two bites him during the Night Game]], he becomes increasingly paranoid, neurotic, obsessive, and secretive. Whatever he's working on in his office, he does ''not'' want to tell anyone about it, and uncharacteristically snaps harshly at anyone who asks. In Episode 26, where he spends the majority of the episode sweating profusely, spacing out while scribbling on paper, repeatedly excusing himself, and [[AmbiguousSituation maybe-accidentally]] stabbing Agent Love with a pencil. Raddagher is the only one who notices that something is severely wrong until Episode 27, where [[spoiler:it's revealed that he's been making an anamorphic Dash One in his office, and he tries to ''carve a rift into Harley's arm.'']]
210[[/folder]]
211
212[[folder:Tabletop Games]]
213* In ''TabletopGame/DungeonsAndDragons'' and ''TabletopGame/{{Pathfinder}}'', mind-altering enchantments leave subtle hints in the victim's behaviour that can be detected with the Sense Motive skill, even if the victim isn't aware of them. ''Very'' subtle, since an average person has only a 30% chance of noticing that someone's been Dominated into being a {{People Puppet|s}}, and other enchantments are even easier to miss.
214[[/folder]]
215
216[[folder:Toys]]
217* Hafu starts to notice that [[KidAppealCharacter Lewa]] is behaving strangely at one point in ''Toys/{{Bionicle}}''. This was the result of Lewa [[GrandTheftMe having his body stolen]] by Tren Krom via a FreakyFridayFlip. The real Lewa was stranded several hundred miles away in the body of an EldritchAbomination which was [[AndIMustScream fused to an island.]]
218[[/folder]]
219
220[[folder:Video Games]]
221* ''Franchise/FinalFantasy'':
222** In ''VideoGame/FinalFantasyIV'', it is said at the beginning of the game that the King's behavior changed. [[FakeKing Of course...]]
223** In ''VideoGame/FinalFantasyVII'', Cloud Strife's character journey is all about this. Due to the combination of his low self-esteem, traumatic experiences, being in coma, being experimented on, having his mind literally shattered, and the influence of Jenova cells injected in his body, he spent a good amount in this game behaving like his best friend [[spoiler:Zack]], presenting himself as a SOLDIER [[spoiler:which in reality he failed to enter, unlike Zack]], and acting as a cold-hearted mercenary. This ends after a [[spoiler:JourneyToTheCenterOfAMind to put his mind back together.]]
224** ''VideoGame/FinalFantasyIX'':
225*** [[spoiler: Zidane]] displays this for a short while near the end of the game. Given his normally cheerful personality, this moment is notable as it hints at [[spoiler: what he was really capable of if he had been acting towards his intended purpose -- i.e., an angel of death and destroyer of worlds]].
226*** A good chunk of the game's first half is driven by Princess Garnet wanting to find out why her mother was not acting like herself. Turns out she was being influenced by Kuja.
227** ''VideoGame/FinalFantasyTactics'': in an early mission, you find a man being menaced by bad guys. You have a choice to either prioritize beating up the bad guys, or saving their victim. Choosing the former prompts the main character's best friend to ask if he's flipped his lid.
228* ''VideoGame/KnightsOfTheOldRepublic'': HK-47 can have a Not Himself moment in the second game if the player installs a Pacifist Package into him. Needless to say, this genuinely scares the hell out of him.
229* ''Franchise/TheLegendOfZelda'':
230** In ''VideoGame/TheLegendOfZeldaMajorasMask'', one of the sidequests you need to complete for OneHundredPercentCompletion is helping a little girl, Romani, with defending the ranch's cows from aliens on the night of the first day. If you fail, the aliens abduct the cows and Romani, since she was also in the barn. They bring her back on the third day--but she can't think straight, doesn't recognize Link, and shakes her head, trying to remember or forget things. It's assumed by the whole fandom that she was lobotomized.
231** In ''VideoGame/TheLegendOfZeldaTearsOfTheKingdom'', one quest involves a fight against [[spoiler:Yunobo]]. His BossSubtitles actually say "Clearly not himself".
232* ''VideoGame/MinecraftStoryMode'': Lukas is uncharacteristically vitriolic during the first half of ''The Last Place You Look'' [[spoiler: because he knows that Jesse is withholding information from the rest of the group.]]
233--> '''Jesse:''' What's up with Lukas?\
234'''Axel:''' Well, as a long time observer of human behaviour--\
235'''Oliva:''' We have no idea.
236* In ''VideoGame/SuperPaperMario'', there's a funny mini-game where you play as Peach trapped in a dating sim and can choose her reactions to the other character's fumbling attempts to court her. You can of course choose to have her react favorably... It's an interesting case in that doing this repeatedly will cause the princess to call ''herself'' on her bizarre behavior.
237* In episode 5 of ''VideoGame/SamAndMaxFreelancePolice'''s first season, you find yourself in a virtual world where four computers are in charge, each one controlling a certain setting (pop-ups, height control, gravity and three-dimensional view). In order to progress you need to place a bug on each one of them at one point or another, with the side effect of completely reversing their personalities. An old Atari console who communicates through beeping and booping begins playing a melody, a smarmy, conversational telephone's voice gets hacky and hoarse, an aggressive arcade machine starts belting out showtunes and an outdated Osborne 1 starts spouting youth slang.
238* In ''VideoGame/{{Faria}}'', a gardener in Teodoor says, "The princess hasn't been eating any of her favorite apples. I wonder if she is sick?" [[spoiler:The reason why, of course, is that she's been replaced by the BigBad in disguise.]]
239* Maya undergoes this in a flashback-themed dungeon in ''[[VideoGame/Persona2 Persona 2: Innocent Sin]]'', acting as a complete opposite of herself, refusing to participate in team conversations with demons, having a much more sinister portrait in fusion spells, and having yellow eyes. While the party notices she's acting rude, they never notice that she's clearly not the same person and wants them dead until the ''real'' Maya shows up.
240[[/folder]]
241
242[[folder:Visual Novels]]
243* In the third case of ''VisualNovel/Danganronpa2GoodbyeDespair'', characters are infected with "Despair Disease", a strange illness that causes a person to gain strange personality traits. As a result, Ibuki becomes polite and agreeable, Nagito becomes a CompulsiveLiar and Akane becomes ProneToTears. [[spoiler: Mikan, the chapter's murderer, also turns out to be infected at the end, as well as something of an Inversion; while she is acting out of character, the Despair Disease actually just removed her LaserGuidedAmnesia and awakened her original BrainwashedAndCrazy {{Yandere}} personality. This explains some of her unusual behaviour from the chapter, such as repeatedly climbing into the protanonist's bed.]]
244* Several examples in ''VisualNovel/DaughterForDessert'':
245** Amanda doesn’t show up for work and doesn’t call out. At another time, she insists that she’s studying with “friends” that the protagonist has never heard of. She also says once that she had a job interview with a company with an obviously fake name. And through all this, she sleeps in her own room rather than the protagonist's. That leads the protagonist to believe that something’s wrong, and sure enough, [[spoiler:Cecilia has been feeding her information about Lainie, manipulated in a way to make him look like a bad guy]].
246** Kathy stops coming to work when the protagonist and Amanda are in Whiskeyville. Heidi chalks it up to Kathy’s temperamental mindset, but the protagonist is convinced that there’s something else behind it. He visits Kathy at her apartment, [[spoiler:and he discovers a big secret that she and Amanda have been keeping from him]].
247** Mortelli is away from the diner for long periods of time following Cecilia’s threat, and when he does show up, he acts weird, even for him. [[spoiler:He’s also been listening to Cecilia, and secretly investigating the protagonist.]]
248* ''VisualNovel/DokiDokiLiteratureClub'': This applies to just about everyone at some point, for dark and spoilery reasons.
249** Your cheerful ChildhoodFriend Sayori is being remarkably un-cheerful and refusing to talk to even you about it. [[spoiler: She's always been depressed, she's just not managing to hide it any more.]]
250** Yuri starts getting overexcited and obsessed over you, to the point that Natsuki talks to you about how she needs help and has never been like that before. [[spoiler: She's being {{Mind Rape}}d to drive you away from her.]]
251** Natsuki doesn't change as radically, but she has moments when she comes across as even more aggressive than [[{{Tsundere}} usually]] or even just sounds downright brainwashed. [[spoiler: Somebody is crudely taking control of her actions at those moments.]]
252** Monika, who was always observant and cared about the happiness of all the Literature Club members, is acting oblivious and callous about what's happening to the others. [[spoiler: She's GoneMadFromTheRevelation and turned sociopathic, and she's the one tormenting the others in an effort to find a way to ease her own pain.]]
253** Once the weirdness has really got going, sometimes when someone says something that shoudn't be in character for them, it's displayed in a different font as if their normal behaviour is being overwritten somehow.
254* In ''VisualNovel/FateHollowAtaraxia'', the fact that many of the characters are nothing like they were in ''VisualNovel/FateStayNight'' is actually an early clue that something's wrong with this reality besides the whole GroundhogDayLoop thing.
255[[/folder]]
256
257[[folder:Web Animation]]
258* ''WebAnimation/{{RWBY}}'': While Ozpin gives his induction speech to Beacon Academy's new students, Ruby and Yang quickly note how troubled he seems, instead of his usual lively self. Ruby even comments that it's as if he's not even present. This is played for mystery, as the girls have no answers to why he's behaving so oddly and the next time he appears he's his normal self again.
259[[/folder]]
260
261[[folder:Webcomics]]
262%%* In ''Webcomic/AlienDice'', Lexx has one of these events later in the comic. It's rather obvious and jarring, considering his usual "nice but distant" personality.
263* In ''Webcomic/CaseyAndAndy'', {{Satan}} places [[MadScientist Andy]] by the Soul-Keeper, an ancient and complicated machine. She was able to tell later he'd been replaced by [[TheStarscream Azrael]] because he hadn't started taking it apart to see how it worked.
264* In ''Webcomic/DeadOfSummer'', [[spoiler:[[Music/TheProtomen Panther]]]] falls under this. At first he seems normal (and awesome), though breaking a bad guy's finger may raise some eyebrows. But later on, he [[EyeScream tears out Dr. Light's eyes]], kills him, and proceeds to reveal that he's [[FaceHeelTurn in league with the Big Bad.]] Turns out he's ''literally'' not himself; [[spoiler:the Panther we'd been following was the EvilTwin. The real one sets things right.]]
265* In ''Webcomic/{{Fans}}'', when Alisin's incurable and deadly blood disease starts to kick in, she sets out to pull an April Shadows in order to leave her loving boyfriend less sad when she goes. [[spoiler:Despite (or perhaps because of) the best efforts of the BigBad and the traitor, he not only figures it out but time travels to a period when the disease has been cured thanks to the FIB's efforts to save ''her'', lets a teammate trick the BigBad into contracting the disease, and thus distracts her long enough to get some of the cure for Alisin. Everything works out- well, sort of.]]
266* ''Webcomic/GirlGenius'': When Agatha is being cruelly flirtatious Tarvek notes that she's acting very strange about a half second before realizing that, ''[[https://www.girlgeniusonline.com/comic.php?date=20101129 "You're acting--gah! You're acting like Lucrezia!"]]''
267* ''Webcomic/GunnerkriggCourt'':
268** In [[Recap/GunnerkriggCourtChapter18S1 Chapter 18]], Robot S13 — previously the comically {{Pollyanna}} ChewToy — abruptly begins acting deadly serious and [[TookALevelInBadass proves to be a dashing swords-bot]] after being transferred to a much older body, much to the surprise of Annie and Kat. He returns to normal after his body is changed once again.
269** After a trip in Zimmy's twisted mind, Jack began becoming [[GoMadFromTheRevelation more and more unstable]]. He gets better after Zimmy [[spoiler: kills the spider that had him possessed.]] This is an interesting case, however, since the audience only really has a chance to get to know Jack's real personality after he's cured.
270* ''Webcomic/{{Nebula}}'': A major plot point throughout the comic is the steadily increasing sense (both in- and out-of-universe) that Sun is really, ''really'' not himself; apart from [[WreathedInFlames burning]] much hotter and seeming to have physically grown, he'd become far more antisocial and [[HairTriggerTemper short-tempered]] than the ReasonableAuthorityFigure he was before. At one point Mars even says "I can't tell if he's angry or in pain or... both. But it's getting worse." [[spoiler:Going by what Sun told Mercury right before it all started, it indeed ''is'' both.]]
271* In ''Webcomic/{{Newshounds}}'', Rochelle being ''afraid'' of danger instead of craving it was the first sign of [[spoiler:her pregnancy]].
272%%* [[http://comic.nodwick.com/?comic=2002-05-02 Parodied by]] ''Webcomic/{{Nodwick}}''.
273* ''Webcomic/TheOrderOfTheStick'':
274** Subverted with Vaarsuvius when [[spoiler: they were empowered by their DealWithTheDevil, as while the fiends claimed that [[ThisIsYourBrainOnEvil any changes to their attitude were caused by the alignments of the people they were channeling]], they later revealed that [[WhoYouAreInTheDark that was just a lies to get them to act more rashly with the excuse of the soulsplice]].]]
275** A straight and more striking example would be Belkar's [[SnapBack very brief]] wisdom boost turning him repentant and pacifistic.
276* ''WebComic/SluggyFreelance'': A bit more complicated in "The Immortal King". Aylee seems to be mad at Torg for some understandable reasons, but her behaviour turns out to be due to [[spoiler: DemonicPossession]], and it's also revealed retroactively Torg had noticed Aylee wasn't herself because she [[spoiler: "would never put Zoë and Gwynn in danger to spite me."]] This is not made particularly obvious to the reader until it's spelled out like that, however.
277* In ''Webcomic/{{UC}}'', when [[http://www.wanderingchaos.com/uc/022012.html Naim]] begins to break his normally stoic attitude to talk to Iku about her love life in great length, it's a sign that the world they have entered is messing with his head, and that she needs to be on guard.
278[[/folder]]
279
280[[folder:Western Animation]]
281* ''WesternAnimation/Ben10UltimateAlien'': When [[Characters/Ben10BenTennyson Ben Tennyson]] has to be in three different places at once, he becomes Echo Echo and then reverts back into 3 of his human forms, one [[{{Jerkass}} arrogant]], one "[[AmbiguouslyGay sensitive]]," and one [[ManChild immature]]. At first everyone rolls with it, [[NiceJobBreakingItHero until they find out what's really going on]], [[WhatTheHellHero to which they promptly chew him out for it]], leaving for one of the few {{Downer Ending}}s in the series.
282* In ''WesternAnimation/TheCrumpets'' episode "The Terrible Teens", Pa, who is a peaceful dad, tries to replace a lightbulb and gets electrocuted. When he wakes up, he acts like an aggressive [[GreaserDelinquents teenage greaser]] and would dress like one. With his wife and Granny out of the house, the kids have trouble with the nuicance. When Pa kisses Ms. [=McBrisk=], she starts acting like a [[NewAgeRetroHippie hippie]]. [[spoiler:Electrocution also reverts them back, but the episode doesn't end without pretty much the rest of the Crumpets left altered.]]
283* ''WesternAnimation/DannyPhantom'':
284** Briefly in the episode "The Ultimate Enemy" where Danny's [[FutureMeScaresMe evil self]], Dark Danny, goes to the past (present time) and disguises himself as his old fourteen-year-old self. His friends wonder what's up with him when he starts speaking rather eloquently, but being a [[ConsummateLiar smart bastard]], Dark Danny quickly fixes this and their suspects drop.
285--->"Who's up for... what did we used to do together? 'Playing video games and raging against the machine?'" "We're in!"
286** Danny also holds the dubious honor of at one point doing this ''twice'' at the same time. An accident splits his personality into the overly dramatic, comic style Hero Danny, and the laid back, mundane (and I quote) 'Fun Danny'. Confusion (and hilarity) briefly ensues.
287* In ''WesternAnimation/MiloMurphysLaw,'' one sign that [[ThePollyanna Milo]] has been replaced by an android is that the impostor impulsively calls people "loser" and overall has a more biting, snarky attitude. He was apparently programmed with an actual "sass" level which was raised too high.
288* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'':
289** In "The Return of Harmony", Twilight is shocked when she sees her friends not acting like their usual selves (Applejack lying, Pinkie Pie constantly grumpy, and so forth) when meeting up with them in Discord's maze, but cannot decipher why and concludes the maze got to them and left them bitter. Little does she know, it's actually through Discord's corruption to stop them from finding the Elements.
290** In "A Canterlot Wedding", Twilight's brother Shining Armor is engaged to her old foalsitter Princess Cadance, which excites her as she's gaining a sister-in-law. When she encounters Cadance in Canterlot however, she's suspicious when she doesn't recognize her SecretHandshake, makes constant demands, and casts a dark spell on Shining, and deduces she's evil. As it turns out, "Cadance" is actually the Changeling Queen Chrysalis, who disguised herself to feed on Shining's love, and imprisoned the real Cadance beneath Canterlot.
291** In "To Where and Back Again", Starlight and Trixie return from a failed mission to find that the Mane 6 and Spike don't remember their names, make excuses to not talk to them, and are generally meaner than they remember. It turns out that all of them were kidnapped and replaced with Changeling imposters.
292** In the infamous "The Mean 6", the mane characters, barring Spike, go on a camping retreat in the Everfree Forest to take some time off from the School of Friendship; when the gang gets separated, they encounter what they believe are their friends somehow acting rude and jerky out of nowhere (Rarity hoarding, Twilight being impatient, Pinkie being bored, etc.); they don't know these aren't really their friends, but EvilDoppelganger lookalikes created by Queen Chrysalis. This causes the ponies to hate each other for the episode.
293* ''WesternAnimation/ScoobyDooMysteryIncorporated'':
294** "Man in the Mirror" has Fred find himself in a post-apocalyptic Crystal Cove accompanied by an older Daphne. Meanwhile in the present, Fred is acting distant and doesn't seem to know what he's doing, which raises suspicion from his friends. [[spoiler:It turns out that Brad and Judy took plastic surgery to impersonate Fred (the one with the gang) and Daphne (the one in the post-apocalypse) respectively in an attempt to steal the {{MacGuffin}} from our heroes.]]
295** A number of characters directly involved in the show's MythArc are shown in flashbacks to have been [[NiceGuy good]] [[UsedToBeASweetKid people]] before [[StartOfDarkness everything]] [[TookALevelInJerkass went down]]. It turns out near the end of the show that [[spoiler:[[HatePlague the Curse of Crystal Cove]] cast by [[BigBad the Entity]] is responsible for corrupting them, [[SealedGoodInACan sealing away their good sides in another mental dimension]]. Fortunately, [[EarnYourHappyEnding they never get corrupted in the new universe]].]]
296* ''WesternAnimation/StarVsTheForcesOfEvil'': In Season 3, [[Characters/StarVsTheForcesOfEvilStarButterfly Star Butterfly]] keeps dropping the statement that she wants to focus on being a better princess to explain her current situation. It would sound like much-needed CharacterDevelopment, but not only is it not like her to do so, it's almost ''too'' convenient that she's said it in rather awkward situations (i.e. having to dance with Tom, Marco suddenly returning). If her conversation with Eclipsa in "Lint Catcher" is of any indication, Star is undoubtedly hiding something and avoiding it.
297* ''WesternAnimation/StarWarsTheCloneWars'' shows this is the case with the clones after Order 66 is activated. Throughout the series, each of them are established as being unique individuals with wildly varying personality and bonds with different Jedi, but after the order is given, they're reduced to mindless, identical, and hateful jackboots loyal only to the Empire. It's even discussed by Tup and Fives when a malfunction causes Tup's biochip to kick in early during a battle.
298--> '''Fives:''' Come on, this is a textbook battle! We've been through this a million times in training.\
299'''Tup:''' Yeah, I know, I-I just... don't feel like... myself.
300* ''WesternAnimation/WinxClub'': Stella was acting very rude and antagonistic to the Winx after her first date. It turned out she was being impersonated by Darcy. [=4Kids=] turned Stella being a bit bitchy with her roomies a few episodes later from being part of her character to being the result of a spell.
301[[/folder]]
302
303[[folder:Real Life]]
304%%* Several illnesses or psychological factors can lead to a person's behavior changing dramatically.
305* On the other end of the brain damage spectrum, it's possible to damage the part of your mind responsible for recognizing people. Not that you'd forget who they were, mind you. You'd know who your mother is, exactly what she looks like, but your mind just won't recognize the person who acts like and looks like your mother as actually being your mother. People with this type of brain damage believe that everyone they know [[Film/InvasionOfTheBodySnatchers has been replaced with an imposter]]. All of a sudden, everyone else in the world is Not Themself.
306* Since most severe mental illnesses don't manifest until adolescence at the earliest, it's not uncommon for patients to seem Not Themselves compared to who they were before the onset of the disorder.
307* The U.S. first learned about the Soviet plan to [[UsefulNotes/HistoryOfTheColdWar put nuclear missiles in Cuba]] when their spy planes captured a bunch of new soccer fields being built, since the most popular sport in Cuba is ''baseball'', applying this trope to an entire country.
308[[/folder]]

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