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Sanity Slippage
Get some sleep, Jack.

"Because madness, as you know, is like gravity. All it takes is a little push!" (Laughs maniacally)

A character has been a bit ... off for a while now. Maybe they just haven't been themselves, maybe they've gone as far as painting a Room Full of Crazy while reciting a Madness Mantra, or maybe they've gone through a Madness Makeover, but it's apparent from their actions that their rational mind is losing its grip and they are sliding inch by inch toward insanity.

The end result of this varies, depending on the tone of the series and who the character is. If the series is dark and edgy, they may go on a murderous rampage. On the other hand, if it's light and soft, it may just be Played for Laughs, becoming a source for their hilarious dialogue and wacky plans. A villain is likely to have a Villainous Breakdown resulting in Karmic Death, while a hero will just have a Heroic BSOD and then get better.

Occasionally, a character will be seen holding back their insanity and generally keeping it in check, until that final straw breaks the camel's back and they finally snap, having a massive Freak Out!.

And most rarely, the Sanity Slippage is the effect of the Villain Gaslighting a victim.

A Super Trope to Sanity Slippage Song.

Compare Go Mad from the Revelation, Freak Out!, Villainous Breakdown, Room Full of Crazy, Madness Mantra, Laughing Mad, and With Great Power Comes Great Insanity.


Examples:

    open/close all folders 

    Comic Books 
  • The Killing Joke is one take on the Sanity Slippage that eventually led to the origin of The Joker. But the Joker admits he's an Unreliable Narrator and could be remembering wrong or making the whole thing up. He attempts something similar to crack Commissioner Gordon. He doesn't succeed.
  • Rorschach from Watchmen is clearly mentally unstable even before the event that causes him to slide off of the slippery slope.
  • Jackson Georges from Ex Machina, Mayor Hundred's former NSA handler fits this trope. In flashbacks the reader is shown how the cryptic shard that Mitchell found when he got his powers slowly drives Jackson to levels of extreme paranoia. He develops an unfounded contempt for Mitchell, claiming that without Mitchell's appearance and the mystery of the shard, he could have foreseen and prevented 9/11. He becomes obsessed with protecting his family from dirty bombs and the like, buying a Hazmat Suit and making tally marks on the wall to represent god knows what. It's clear he's a step away from the deep end. Darkly subverted when in desperation to save their failing marriage, his wife breaks into his work shed and steals the shard. A few seconds near a TV are enough to drive her completely and utterly insane, leading her to kill her daughter, husband, and dog. She even chops off her own arm with the shard itself. It was an incredibly jarring and brutal twist on the slow burn of paranoia the reader had been witnessing for months.
  • J. Jonah Jameson from Spider-Man suffered a nervous breakdown late in Marv Wolfman's run, to the point where he believed Spider-Man was stalking him. However, Wolfman left the book before long, and Roger Stern retconned the whole thing away as mind-control.
  • Jean-Paul Valley's stint as Batman during the "Knightquest" portion of the Knightfall storyline was this. After being doused with the Scarecrow's Fear Gas, the hypnotic trance known as The System kicked in, haunting Jean-Paul with images of his father and of Saint Dumas, the "creator" of the order he once was part of. As he's haunted by these apparitions, The System drives him to be more brutal and continuously modify the Bat-Costume, the pinnacle being when he allowed Abbatoir to die, condemning his captive to death, modifying the Bat-Costume to the point where it was less Batman and more Azrael and outright alienating Robin, Commissioner Gordon, and Bruce Wayne and deciding that all criminals need to be put out of their misery. It's at that point that Bruce decides enough is enough and sets out to take back the Mantle of the Bat.
  • In Sonic the Comic in the events leading up to the Sonic Adventure adaptation, Robotnik begins to lose it, first trying to destroy Mobius, and later gathering the Chaos Emeralds, the Freedom Fighters, and Chaos itself to his retreat so they would all die together. After this fails, he becomes little more than a catatonic, drooling mess in Sonic the Comic Online!.
    • In the same vein, Dr. Eggman in Archie Comics' Sonic the Hedgehog goes into a slow burn Sanity Slippage 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.
  • After Optimus Prime dies (the first time, that is) in The Transformers, Megatron takes it poorly, and becomes convinced Optimus is still alive and planning something. His madness eventually winds up causing him to shoot at the Space Bridge, which promptly explodes and apparently kills him. Or not, as it turns out Megatron was just Obfuscating Insanity, and using his 'death' as a cover to return to Cybertron. He just miscalculated when shooting the Space Bridge, resulting in a spot of Laser-Guided Amnesia.
  • Though the titular character of Johnny the Homicidal Maniac starts out by no means sane, he somehow manages to get worse over the course of the story, as his telling of the story gets steadily less believable, he gets talkier, less predictable and increasingly suicidal. It helps that he's being targeted by The Corruption (maybe), lives in a Living Labyrinth, and regularly murders people.
    • However, toward the end of the story, Johnny does kill himself and comes back (maybe), after which he stops hearing compelling voices and seems much saner. He does, however, still murder people.

    Fan Works 
  • Jack O'Lantern, the Arch-Enemy of Ultimate Spider Woman, commits increasingly violent and destructive crimes as the series progresses. He goes from robbing banks to taking people hostage to going on killing sprees to orchestrating a bloody city-wide Mob War. Even in jail, we see him fantasizing about carving up human heads the way people do Halloween pumpkins. What's unusual is that Jack always had these sadistic urges-the Sanity Slippage comes from the escalating nature of his crimes.
  • Axis Powers Hetalia: Austria/Roderich Edelstein in the 1983: Doomsday Stories is portrayed for the most part as undergoing through this. His obsession in finding out whether Hungary survived Doomsday grows increasingly desperate (and irrepressible) over time to the point that others eventually start wondering if he's gone delusional from grief. He doesn't. It's also mentioned to have happened as well with Romano (hijacked by The Mafia as his brother's successor) and Poland (having his personality shattered).
  • Calvin goes a little crazy trying to watch a pug in Calvin & Hobbes: The Series.
  • In the vein of the Cutie Mark Failure Insanity Syndrome described above in the Western Animation section, The Audience by Reality Check states that Trixie herself is diving into one as her special talent isn't magic like most unicorns, but rather stage magic, illusions and theatrical personalities. The constant heckling, jeers and challenges towards her achievements that she was receiving were making her the Jerk Ass that she was portrayed as in canon.
  • Total Drama Stranded: Briony gets a major one very quickly when Calvin begins relentlessly bullying her.
  • From the sister story, Total Drama Switcheroo, Missy gets an even bigger one.
  • Queen Of All Oni: Her encounter with Lung leaves Jade with some severe PTSD, which only worsens as time goes on. It finally culminates with her confrontation with Tohru in the Vault of Endless Night, which convinces her the heroes are all out to kill or seal her, at which point she snaps completely.
  • The final story of Calvin & Hobbes: The Series has two separate plotlines: one concerning the return of Thunderstorm and another concerning the Slender Man showing up. When the stories intersect, Thunderstorm starts displaying signs of this.
  • Nav starts showing signs of this in Diaries of a Madman, as he becomes far more reckless and depraved over the course of the story.
  • Spike goes through one throughout Zenith, which stems from his Undying Loyalty to Twilight.

    Music 
  • Songs about going insane are quite common, actually. Many examples at Sanity Slippage Song.
  • "Stan" by Eminem shows the story of a fanboy with a seriously screwed-up life and a downward spiraling sanity. The video starts with Stan bleaching his hair just like Eminem's, then Stan starts writing letters to him every so often in his room all plastered with posters of Eminem, then he sends Eminem a really pissed off letter complaining about how he missed Stan and his brother at a gig. When his pregnant girlfriend scolds him for wasting his day on watching Eminem, that's the final straw on the back, and he ends up tearing all his posters, tying his girlfriend in his car's trunk, and driving off a bridge.
    • Then Eminem sends back a letter, and starts by apologizing for how long it's taken him to finally respond. Trippin'. Best part: In his response letter, Eminem decides to cite a story he heard on the news about a guy who drove his car off a bridge with his pregnant girlfriend in the trunk, in the hopes that it'll get Stan to calm down a bit. Then Eminem realizes the news story was about Stan. "Damn," indeed.
  • The Nine Inch Nails album The Downward Spiral is a Concept Album that's about Exactly What It Says on the Tin: the gradual destruction of an unnamed man, from the beginning, to his suicide.
  • The Violent Femmes' "Country Death Song" is pure American Gothic: rural guy goes mad from isolation and boredom, throws his little daughter down a well, then broods over his guilt till...you can probably imagine.
  • Pink Floyd's The Wall chronicles a man slowly alienating himself from the world, causing his mind to collapse on itself until finally what's left of his sanity stages an intervention and forces him to actually deal with his problems.
    • The band's previous albums, The Dark Side of the Moon and (especially) Wish You Were Here, were inspired by the real-life sanity slippage of former bandleader Syd Barrett, who had become impossible to work with. "Now there's a look in your eyes / like black holes in the sky". His former bandmates reluctantly dropped him and felt guilty about it ever after. The two albums were enormously successful, but the subsequent non-stop grind of touring to unappreciative audiences caused Roger Waters to suffer a sanity slippage of his own, which directly inspired The Wall. Which was an even more enormous success!
  • By Coheed and Cambria's third album, the author in the frame story of their sci-fi epic has started talking to a bicycle and making both death threats and declarations of love to the ex-lover for whom he wrote the story. In the previous albums the author was not a significant character, and the only real sign of his instability was the fact he was writing the kind of material you can make a Prog Rock Concept Album out of.
  • Gorillaz: Both Murdoc and 2D show signs of this as of phase 3, rambling and gibbering like never before. 2D seems a bit sharper than earlier chapters, though, while Murdoc's just gotten bolder and more malevolent.
  • Napoleon XIV's immortal ''They're Coming To Take Me Away, Ha-Haaa!!" starts off sounding like a love gone wrong, but it turns out he's addressing his dog.

    Professional Wrestling 
  • Randy Savage became increasingly paranoid of other wrestlers trying to make moves on Miss Elizabeth as time went on, which in truth, they were. But as it is said, just because they're out to get you doesn't mean you aren't paranoid.
  • Brian Pillman, due to an increasing string of injuries cutting down on his in-ring time.
  • This is how ECW explained the transformation of narcissistic Johnny Polo to the chronically depressed, manipulative cult figure Raven.
  • Having his mask stapled to his head and then being hung by Ring of Honor's Hang Men 3 really took a toll on Delirious's sanity. As the name implies, he was already a Cloud Cuckoo Lander but the experience drove him Ax-Crazy enough to concoct a poison designed to restrict the airway, which he stored in his mouth!
  • Mickie James's obsession regarding Trish Stratus started about as innocently as an obsession could conceivably be (she used Trish's moves in new ways, hung around, sung her praises, ect). But then Mickie started giving up her own good fortunes for Trish, first admirably but later...to the detriment of her own health. Then Mickie started dressing like Trish. Then she got jealous of anyone who spent any significant time Trish, be it Trish's preexisting protege Ashley or Trish's boyfriend Chad. When Mickie basically rested her head on Trish's crotch and refused to move it that was enough for Trish but the descent of Mickie's sanity had only just begun.
  • R-Truth turned heel after losing out on a WWE Championship opportunity. And after that, his mind.
  • Daniel Bryan. Yes! Yes! Yes! Yes! Yes! And after AJ Lee left him at the altar, it turned into: No! No! No! No! No!
  • In 2010, poor Shawn Michaels started losing his mind after not being able to beat The Undertaker at WrestleMania XXV. And after WrestleMania XXVI, his career. He regained his sanity at this point.
  • AJ Lee's descent into insanity began when Bryan first dumped her after Wrestlemania — needless to say, he would regret it. It's been over a year and AJ still hasn't regained her sanity yet.
  • Su Yung had been slipping toward insanity since at least 2009 thanks to an inferiority complex regarding Tracy Taylor. A tour of Japan was supposed to help her get better but thanks to a few encounters with "Sweet" Saraya in SHINE she seems to have completely lost it in 2014...completely.
  • If Su Yung's the long case, Kimberly Maddox is the alarmingly short one, as in two shows in two months short, over the fact she couldn't get a win in the Shine promotion. However, Leva Bates theorized that Kimberly already had narcissistic personality disorder, so she likely didn't start very far up the slope.

    Radio 
  • Bleak Expectations: A few days on a dessert note  island drive Pip Bin utterly made, to the extent that he loses track of time, and considers eating himself, only relenting when he realises this is "probably a bit of an own goal". He quickly recovers when he finds someone to boss around.

    Tabletop Games 
  • A daily occurrence in Warhammer and Warhammer 40,000; living in an endlessly terrible Crapsack World will do that. Witches/psykers are especially vulnerable to Slippage, thanks to the source of their powers being the home of The Legions of Hell.
  • Also appears in Warhammer Fantasy Roleplay, it has a mechanic for going insane and lists quite a nice amount of mental illnesses for which your character can suffer
  • Call of Cthulhu is famous for introducing the SAN attribute, which drops a little each time the players encounter a monster or cast a spell, or something.
  • Everyone in New World of Darkness, from normal humans to blood-hungry vampires to reality-bending mages, has a Karma Meter. As you slide down the slippery slope, you tend to become a little more unstable with each step, until finally, humans are reduced to raving lunatics, vampires and werewolves go nuts and become meat-hungry animals, mages and changelings fly off the deep end and lose the ability to separate reality from fantasy, and prometheans lose hope of ever becoming humans.
  • The Old World of Darkness also has sanity-slipping Karma Meters, though not all splats have them.
  • The fan-made World of Darkness game Genius The Transgression is unique in that players start out insane by nature of their profession, and as they lose Obligation start unconsciously altering reality to fit their delusions.
  • Exalted loves this trope:
    • The Solars gradually experience this as they become more and more godlike, from both the Great Curse and general detachment from humanity and less powerful divine beings.
    • Being close to a Primordial War survivor in the First Age can be dangerous, humiliating, and bad for your physical, mental, and social health.
    • Also happens to Infernals. They have access to Yozi Charms. Everything the Yozis are, is made of Charms. Most of the Yozis are insane, and their Charmsets tend to be arranged so that the good stuff with no drawbacks is padlocked by something with benefits that makes you a little crazier. The best example of this is Kimbery, who has an entire Charm tree (built on The Power of Hate) locked behind something that permanently skews the sanity of its user to be either more naive or more vindictive, depending on the chosen variant.
  • In Fading Suns, Psychics and Theurgists are prone to "Urge" and "Hubris" respectively.
  • Characters in Eclipse Phase are very hard to kill permanently due to cortical stacks and backups, fortunately for GMs there's a mechanic called "stress points" that can cause psychological disorders or permanent catatonia if the PC lets them accumulate.
  • Any Killer Game Master worth the title can put this into any game.

    Theater 

    Visual Novels 
  • Sakura in Fate/stay night. It's like everything anyone ever says to her is another stab at her self confidence. And then Shinji tries to rape her one more time, and then he'll tell Shirou about it. Yeahhhh things kind of go downhill from there. Oh, and she was already eating people in her sleep, passing out frequently and also quietly going crazy anyway. She does get better, however.
  • Nine Hours, Nine Persons, Nine Doors has Clover, waking up and being forced into playing the Nonary Game. For a second time. She is fine over this. What gives her a dive in the deep end, is Snake's death. Apparent in the "Axe" ending.
    • The 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.
  • Higurashi no Naku Koro ni has this occur several times, almost once an arc, and often bloodily.
  • The sister series, Umineko no Naku Koro ni, reveals in the fifth arc that Natsuhi has slowly been losing it since Kinzo died two years before the story begins.
    • Arc 3 of Umineko also has Eva/Eva-Beatrice really losing it, first after finding the gold and then after Hideyoshi is killed. By the end of the arc, she's gone completely apeshit and shoots Battler.

    Web Comics 

Napoleon DelusionMadness TropesSanity Slippage Song
Reverse PsychologyPsychology TropesSanity Strengthening
PsychopompImageSource/WebcomicsSealed Evil in a Teddy Bear
Sanity Has AdvantagesAdministrivia/No Real Life Examples, Please!Scam Religion
Sanctuary of SolitudeAdded Alliterative AppealSanity Slippage Song
Bad BossOverdosed TropesSmall Name, Big Ego
Politically Incorrect HeroCharacters/The AwesomesGovernment Agency of Fiction

alternative title(s): Descent Into Madness
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