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* ''Webcomic/TeamRocketRoots'': After her favorite agent, Miya, went mysteriously missing while on a mission, Team Rocket's Madame Boss began slipping.

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* ''Webcomic/TeamRocketRoots'': After her favorite agent, Miya, went mysteriously missing while on a mission, Team Rocket's Madame Boss Gianna began slipping. slipping.
* ''Fanfic/RocketToInsanity'' is a fanfic where ''Fanfic/{{Cupcakes}}'' is a nightmare of Rainbow Dash's. She keeps on having it over and over again. It gets to the point where Rainbow Dash withdraws from her life and distances herself from everyone else. When Pinkie Pie tries to cheer up Rainbow with a cupcake, Rainbow snaps and kills Pinkie in what-she-thinks is self-defense.


** In the same vein, Dr. Eggman in ''ComicBook/ArchieComicsSonicTheHedgehog'' goes into a slow burn SanitySlippage after Sonic, Tails, Knuckles and Amy are able to rescue the captured citizens of Knothole, set them up in the nanite-built city of New Mobotropolis, and defeat the machine that defeated Sonic earlier. Things get worse when Knuckles-as-Enerjak destroys Eggman's city and sky fleet and, by the time issue 200 rolls around, Sonic delivers one last defeat that causes Eggman to flip out, ''tear his mustache apart'' and devolve into a blabbering mess.

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** * In the same vein, Dr. Eggman in ''ComicBook/ArchieComicsSonicTheHedgehog'' goes into a slow burn SanitySlippage after Sonic, Tails, Knuckles and Amy are able to rescue the captured citizens of Knothole, set them up in the nanite-built city of New Mobotropolis, and defeat the machine that defeated Sonic earlier. Things get worse when Knuckles-as-Enerjak destroys Eggman's city and sky fleet and, by the time issue 200 rolls around, Sonic delivers one last defeat that causes Eggman to flip out, ''tear his mustache apart'' and devolve into a blabbering mess.


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* ''Webcomic/TeamRocketRoots'': After her favorite agent, Miya, went mysteriously missing while on a mission, Team Rocket's Madame Boss began slipping.


* In the ''VideoGame/{{Undertale}}'' fanfic ''FanWork/AlphysHoek'', this gradually happens to Alphys over the course of each chapter, partially as a result of [[AndIMustScream having to deal with the game's fanbase 24/7]] and also partially as a result of the unspeakably humiliating things that Mettaton forces her to do on public TV where everyone in America can see her; by the end of the story, she's a literal genderbent [[TheRenAndStimpyShow Ren Höek]] who's completely hell-bent on [[BadassAdorable twisting Mettaton's neck in his sleep.]]

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* In the ''VideoGame/{{Undertale}}'' fanfic ''FanWork/AlphysHoek'', this gradually happens to Alphys over the course of each chapter, partially as a result of [[AndIMustScream having to deal with the game's fanbase 24/7]] and also partially as a result of the unspeakably humiliating things that Mettaton forces her to do on public TV where everyone in America can see her; by the end of the story, she's a literal genderbent [[TheRenAndStimpyShow [[WesternAnimation/TheRenAndStimpyShow Ren Höek]] who's completely hell-bent on [[BadassAdorable twisting Mettaton's neck in his sleep.]]


* ''Comic Book/{{Thunderbolts}}'': Norman Osborn has now taken over Tony Stark's job of national security, and is in charge of a group of superpowered villains that work for the government and capture unregistered superheroes. Every once in a while he is asked about his previous alter ego the Green Goblin, every time that name comes up, Osborn begins to crack a little. Every time he hears the name Spider-Man he cracks even more. Also it doesn't help that his second in command Moonstone is gaslighting him (leaves his Green Goblin mask in his desk), and switching out his medication, just to drive him over the slope, just so she can get his job. It works.

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* ''Comic Book/{{Thunderbolts}}'': ''ComicBook/{{Thunderbolts}}'': Norman Osborn has now taken over Tony Stark's job of national security, and is in charge of a group of superpowered villains that work for the government and capture unregistered superheroes. Every once in a while he is asked about his previous alter ego the Green Goblin, every time that name comes up, Osborn begins to crack a little. Every time he hears the name Spider-Man he cracks even more. Also it doesn't help that his second in command Moonstone is gaslighting him (leaves his Green Goblin mask in his desk), and switching out his medication, just to drive him over the slope, just so she can get his job. It works.


* ''Comic Book/Thunderbolts'': Norman Osborn has now taken over Tony Starks job of national security, and is in charge of a group of superpowered villains that work for the government and capture unregistered superheroes. Every once in a while he is asked about his previous alter ego the green goblin, every time that name comes up, Osborn begins to crack a little. Every time he hears the name Spiderman he cracks even more. Also it doesn't help that his second in command Moonstone is gaslighting him ( leaves his green goblin mask in his desk), and switching out his medication, just to drive him over the slope, just so she can get his job. It Works!

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* ''Comic Book/Thunderbolts'': Book/{{Thunderbolts}}'': Norman Osborn has now taken over Tony Starks Stark's job of national security, and is in charge of a group of superpowered villains that work for the government and capture unregistered superheroes. Every once in a while he is asked about his previous alter ego the green goblin, Green Goblin, every time that name comes up, Osborn begins to crack a little. Every time he hears the name Spiderman Spider-Man he cracks even more. Also it doesn't help that his second in command Moonstone is gaslighting him ( leaves (leaves his green goblin Green Goblin mask in his desk), and switching out his medication, just to drive him over the slope, just so she can get his job. It Works!works.


* In ''FanFic/TheStoryToEndAllStories'', [[spoiler:the villain has gradually descended into madness to the point that he is unrecognizable.]]

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* In ''FanFic/TheStoryToEndAllStories'', [[spoiler:the the villain has gradually descended into madness to the point that he is unrecognizable.]]

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* ''VisualNovel/{{Grisaia No Kajitsu}}'': In her bad ending [[spoiler:Makina goes through this after watching Yuuji die right in front of her. She proceeds to keep his rotting body in a trash bag talking to him, believing he is still alive.]]

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* [[https://www.deviantart.com/onthemountaintop/art/My-Life-with-Asperger-s-588279880 "My Life with Asperger's"]] directly references this trope name when going onto the topic of having a meltdown.




PLEASEDONTLETTHEMGETTOMEPLEASEGODHELPMEOHGODTHEYREHEREHELPMEOHGODNOHELPMEHELPMEHELPMEPLEASEHELPME

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\n\nPLEASEDONTLETTHEMGETTOMEPLEASEGODHELPMEOHGODTHEYREHEREHELPMEOHGODNOHELPMEHELPMEHELPMEPLEASEHELPMEPLEASEDONTLETTHEMGETTOMEPLEASEGODHELPMEOHGODTHEYREHEREHELPMEOHGODNOHELPMEHELPMEHELPMEPLEASEHELPME
----

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* ''FanFic/CodeGeassMegiddo'': Suzaku has been on a gradual descent to insanity after he murdered his father [[spoiler:to save Lelouch and Nunnally's lives]], but after Euphemia's death and the events that transpired as a result of that (including learning that his best friend was his ArchEnemy), that descent accelerated and never stopped. By the time the narrative truly starts, Suzaku's MaskOfSanity is barely holding on and begins to crack when Lelouch is kidnapped by the Black Knights, cementing his inevitably return as Zero, and full-on ''breaks'' when they finally confront each other at Pearl Harbor. At this point, several other characters have become aware of how insane Suzaku truly is, and believe that if Lelouch still cares for Suzaku, on ''any'' level, killing him would be ''merciful''.


* Bryce of ''Webcomic/WeAreTheWyrecats'' is falling victim to this due to a tumor in his brain.



* Bryce of ''Webcomic/WeAreTheWyrecats'' is falling victim to this due to a tumor in his brain.

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* Bryce of ''Webcomic/WeAreTheWyrecats'' is falling victim to this due to a tumor in his brain.

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*''Comic Book/Thunderbolts'': Norman Osborn has now taken over Tony Starks job of national security, and is in charge of a group of superpowered villains that work for the government and capture unregistered superheroes. Every once in a while he is asked about his previous alter ego the green goblin, every time that name comes up, Osborn begins to crack a little. Every time he hears the name Spiderman he cracks even more. Also it doesn't help that his second in command Moonstone is gaslighting him ( leaves his green goblin mask in his desk), and switching out his medication, just to drive him over the slope, just so she can get his job. It Works!


** [[spoiler: The [[WordOfGod author has suggested]] that something traumatic changed Akane in the previous Nonary Game, leaving her cold, vengeful and capable of eliminating everyone who gets in her way.]]


Compare GoMadFromTheRevelation, FreakOut, VillainousBreakdown, RoomFullOfCrazy, MadnessMantra, LaughingMad, and WithGreatPowerComesGreatInsanity. If this is a backstory it's PreInsanityReveal. Compare SlowlySlippingIntoEvil.

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Compare GoMadFromTheRevelation, FreakOut, VillainousBreakdown, RoomFullOfCrazy, MadnessMantra, LaughingMad, and WithGreatPowerComesGreatInsanity. If this is a backstory it's PreInsanityReveal. Compare SlowlySlippingIntoEvil.
SlowlySlippingIntoEvil. The opposite of SanityStrengthening.

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