Dream: And do you think he is the only one, my sister?
Sometimes the world you find yourself in is so grim or stressful, if not horrific, that the only way to keep from going crazy is to... well, go crazy. You thus end up acting in silly, if not bizarre, ways, just to keep from truly losing it for good due to all the horror and depression and genuine lunacy surrounding you.
Basically, it's when the standard of "sane" is lower in this world.
A common trait of Byronic Heroes. Often a staple of wartime environments and the resultant Black Comedy which often transpires, where the psychological demands of having to deal with death and suffering on a daily basis requires pretty extreme measures to retain one's grip on reality. Compare Bored with Insanity, and Safety in Indifference, which is another popular coping mechanism for the same predicament. Contrast with the so-called "Catch-22" situation, where going crazy is conclusive evidence that you're sane enough to stay on the job.
- This is the Central Theme of Denpa Teki na Kanojo, to explore the ways in which humans rationalize trauma. The antagonists (and one of the protagonists) had a Dark and Troubled Past, and the only way they found to keep themselves functional in the world after crossing the Despair Event Horizon was to become Crazy Sane. So They Look Just Like Everyone Else! until they have their particular Freak Out!
- Berserk: Much of the cast exhibits various expressions of this trope, both whether for good, evil or something grayer. With all the terrible, horrible things and people, most characters need to abandon some part of their sanity just to stay functional. For example, following the Eclipse, Guts abandoned much of his empathy to pursue revenge against the demons, the Godhand and Griffith regardless of civilian casualties (though that brought other problems) and Casca regressed to an infantile state to deal with the horrors she herself suffered during the Eclipse, in particular Femto raping her. The Crapsack World of Midland is just that bad.
- Attack on Titan: Eren Yeager. Seriously, if his Unstoppable Rage and Titan Shifter powers weren't extremely useful against the giant man-eating mutants whose existence caused them in the first place, he'd most likely be in a padded cell. Notably, he already had the Unstoppable Rage even as a small child, long before witnessing his mother's murder and long before he had the strength and skill to back it up.
- Naruto has a peculiar example. While nothing concrete has been said in-series, an idea accepted by the general fandom is that many of the ninjas' various quirks (Kakashi's "reading material," for example) are all actually coping mechanisms to deal with living the dangerous and traumatic life of a ninja. Given the amount of very memorable characters based on quirks, there is an understandably large amount of evidence for this fan theory.
- The quote comes from The Sandman, describing Emperor Norton of San Francisco.
- Some interpretations of The Joker depict him as "super-sane" rather than crazy: he sees how ridiculous and mixed-up the world is, and the only way for him to deal with it is by treating it as one big joke. Rare writers even imply that he outright knows he is a villain in a comic book, in which case he is perfectly sane since he is only playing out the role he was literally made for, on top of knowing that nobody he harms is actually a real person.
- Batman himself may also be a prime example. Grant Morrison has said in interviews that this is how he views Batman: "I never really subscribed to the idea that Bruce was insane or unhealthy. Bruce Wayne would have gone mad if he HADN'T dressed as a bat and found a startling way to channel the grief, guilt and helplessness he felt after the death of his parents. Without Batman, Bruce would be truly screwed-up."
- The idea that Bruce would be even more screwed up without Batman is shown in the JLA story "Divided We Fall" that split the two identities into different people. Bruce is reduced to a mass of rage and grief without his outlet as Batman. Batman meanwhile becomes much more personable but barely does anything more than the bare minimum of hero work, since he doesn't have Bruce's issues that make him keep people at arm's length but also has basically no drive without Bruce's anger.
- The Comedian from Watchmen dealt with the terrible things he saw and did by seeing the world as a huge joke. He has a total breakdown when he discovers a horrible scheme that even he can't laugh off.
"Once you realize what a joke everything is, being the Comedian is the only thing that makes sense."
- Len Kaminski's interpretation of The Creeper, as seen in the 1997-98 series: Jack Ryder has to periodically let the Creeper out, otherwise he'll go permanently insane.
- Deadpool may be a case of this. An optional dialogue in Marvel Ultimate Alliance, though of questionable canon, goes as follows:
Deadpool: You know how people talk crazy because they're insane? I talk crazy to keep from going insane.
- In Concerning Us the only reason Janine is able to bear living on after losing her brother is because she went insane.
- In Researcher Twilight after getting a piece of shrapnel in her head after a Magitek reactor explosion Twilight Sparkle starts hearing voices. This saves her life later when an experiment gone wrong causes her to poison herself. Twilight becomes too disoriented by the poison to brew an antidote, but the part where the voices come from doesn't and ends up talking her through it.
- Child of the Storm: Upon meeting Cowl during the Bloody Hell arc of the sequel, Wanda determines that while he's clearly crazy, he's the kind who can pass for sane, which makes him even more dangerous.
- It's hinted that this trope is applicable to Stephen Strange as well: When you're 500,000 years old, been battling Eldritch Abominations for millennia, and running up and down the roads of time getting history and all of its players to where you want them to be, you kind of have to go bonkers, at least a bit.
- The Infinite Loops: It is generally accepted canon that every single Looper, due to the Time Abyss "Groundhog Day" Loop nature of the Loops, has become at least somewhat insane in order to deal with the stress. There is also a In-Universe mental condition referred to as "Sakura Syndrome" which details what happens when a Looper has a mental breakdown and goes all the way insane (it's never pretty).
- It is repeatedly stated that the single most important task of an Anchor is to remain mentally stable, and just as repeatedly stated that this is not the same thing as being mentally sane. On occasion, we get to see loopers explaining their mindset to nonloopers, who tend to be at least a little disturbed by how their thought process works.
- M*A*S*H is an obvious example, with Hawkeye and Trapper being the most prominent in the film version.
- Private Handjob gets discharged from the Marines in Full Metal Jacket for compulsive masturbation.
- In Zombieland, Tallahassee suggests the gang smash everything in a store in order to keep from going crazy.
- Applied to the corporate world in Head Office:
Jack Issel: What about you? You're not like the rest of them. How do you survive it?
Max Landsberger: I just go with the flow. I flipped out years ago. I only look sane, but I'm not. The secret is you have to be crazy to maintain your sanity up here. But you're sane, Jack. That's why you're going crazy.
- In The Voices, what happened when, at the insistence of his therapist and his crush Fiona's disembodied head hallucination, the hero Jerry eventually took his pills? He dreamed about dark memories of his childhood during his sleep, then brutally awoke in a disgustingly filthy home (in his altered state of mind, the home looks very bright and clean), and the pets stopped talking. Fiona's head stopped talking too, and now looked like a rotting corpse. Needless to say, Jerry is very freaked by this experience and immediately gets rid of his pills. When he awakes the following morning, things are back in their usual state, to his relief.
- The Hitchhiker's Guide to the Galaxy:
- In Life, the Universe and Everything, after being stranded for far too long on a primitive planet with nobody to talk to but some trees, Arthur Dent finally announces to the world "I shall go mad!"... just before running into his old friend Ford Prefect, who drags him into chasing a floating Chesterfield sofa across an empty field. (Arthur takes a moment to appreciate the fact that just for once, his day is going exactly to plan.) Ford himself had gone insane to keep from going insane with boredom, convincing himself that he was a lemon and spending some time jumping in and out of a lake that thinks it's a gin and tonic (at least, he thinks it thought it was).
- In So Long, and Thanks for All the Fish, Wonko the Sane concluded that the whole world had gone mad after finding usage instructions on a package of toothpicks, and made his house an inside-out "Outside the Asylum" (the rest of the world is "Inside the Asylum").
- The Duck Man in the Discworld series has suffered many setbacks in his life, some of which we've seen and some of which remain mysterious, and through it all he's remained intelligent, cultured and a wellspring of good sense — except that he is never seen without a duck on his head, the existence of which he denies if anybody ever asks about it.
- We do see once that from his perspective he is constantly and inexplicably surrounded by people who see ducks where there are none.
- In The Name of the Wind, this is actually a problem. Early in the book, insanity is mentioned as one of the ways people deal with pain, along with sleep, forgetfulness and death: when the world really is awful, sometimes the only way to end suffering is to escape reality. Later, we discover that the immortal Haliax has spent millennia dealing with horrible grief and loss while unable to sleep, forget, die or go insane. And so he has decided, rationally, that the only way to end his suffering is to end the world.
- In Brain Twister by Randall Garrett and Laurence Janifer, most people with a particular mental condition are catatonic or gibbering wrecks. The one known exception is Miss Thompson, who is not only compos mentis, she's arguably the sanest and most sensible character in the book — except that she's unshakeably convinced that she's a 400-year-old immortal who used to be Queen Elizabeth I.
- Moby-Dick: Captain Ahab is a pretty competent The Captain, and seems perfectly normal until he talks about his Animal Nemesis. Pip goes mad from the revelation when he drowned twice and becomes a Talkative Loon with very interesting conversation. After a chapter tells us Perth The Blacksmiths tragic life, Ahab himself asks why Perth averts this trope:
Well, well; no more. Thy shrunk voice sounds too calmly, sanely woeful to me. In no Paradise myself, I am impatient of all misery in others that is not mad. Thou should'st go mad, blacksmith; say, why dost thou not go mad? How can'st thou endure without being mad? Do the heavens yet hate thee, that thou can'st not go mad?
- In Elantris this is said to be the case with Aandan who decided he couldn't face his Fate Worse than Death in Elantris sane and chose to go mad instead. He becomes sane again after Raoden defeats him and shows him a better way.
- Gabriel Syme from G. K. Chesterton's The Man Who Was Thursday.
- M*A*S*H follows directly in the movie's footsteps, practiced by several characters throughout the series' run, most notoriously by Klinger (who wasn't in the film).
- Dr. Sidney Freedman specifically said this about Hawkeye:
Dr. Freedman:' Anger turned inwards is depression. Anger turned sideways... is Hawkeye.
- In one episode, a fellow soldier eats Klinger's heart out by being sent home for making sock puppets and talking to them. Well, until he starts firing REAL bullets at imaginary gliders and equally-imaginary enemy soldiers. Then even Klinger called him nuts.
- Dr. Sidney Freedman specifically said this about Hawkeye:
- John from Farscape goes gradually crazy over the seasons. The alternative would have been trying to keep it together, then snapping and destroying the universe with a geometrically growing wormhole.
- Psych protagonist Shawn Spencer has this to an extent. It's implied some of his quirky behavior and mannerisms are his way of dealing with the truly serious situations of detective work. Most notably in the Yin-Yang trilogy of season finales, as he has to ask his Straight Man and partner Gus to do it because of how the murderer singled Shawn out for the sick game.
- One interpretation of the Doctor in Doctor Who, at least according to Matt Smith:
Matt Smith: That's what interests me about the Doctor because, actually, look at the blood on the man's hands. 900 years, countless very selfish choices, and he's literally blown planets up. His own race, you know, that's all on his hands. Which is why I think he has to make silly jokes and wear a fez. Because if he didn't, he'd hang himself.
- When Mickie James first started feuding with Victoria, it was because Mickie was crazy, crazy enough to keep coming back after defeats, to blindly charge her larger opponent even when Victoria was armed with bat. While Mickie did realize she was crazy and try to reign herself in Victoria was so tired of losing she tried to make herself crazy in hopes it would allow her to beat Mickie again.
- In Jane Wagner's The Search For Signs Of Intelligent Life In The Universe (a one-woman show performed by Lily Tomlin).
Trudy: But I don't ever want to sound negative about going crazy. I don't want to overromanticize it either, but frankly, goin' crazy was the best thing that ever happened to me. I don't say it's for everybody; some people couldn't cope.
- Johnny Powell from The Darkness II. Ostensibly a babbling lunatic, there happens to be no one else on the planet who knows more about the titular Darkness or a lot of the other supernatural goings-on than Johnny.
- Assassin's Creed I: Subject 16 only managed to accomplish the very, very important task set to him by doing things that no sane person would ever do.
- Isaac Clarke spends most of the Dead Space series teetering on the edge of sanity, but managing to persevere and fight through Necromorph infestations. The second game in particular has him constantly being tormented by Marker visions and severe post-traumatic stress disorder, especially when he's forced to once again board the Ishimura.
- Tomb Raider (2013): After learning his motives, Lara speculates to herself that Mathias has gone so far out of his mind that he's "come right back around to some kind of sane."
- In Dragon Age II, Hawke with a sarcastic personality often comes across as this, having become a Stepford Smiler and Sad Clown in response to all the craziness in Kirkwall and personal tragedies they've suffered over the course of the game.
- In Star Wars: The Old Republic, this is a valid interpretation for a Sith Inquisitor, who is "differently rational" even under the best of circumstances. Doubly so for a Light Side Inquisitor, who is trying not to replicate the Ax-Crazy mentality that counts as "normal" for a Sith.
- In most Fate works, the Madness Enhancement trait and the Berserker class represent insanity too severe to speak and be understood. In Fate/Grand Order, many of the new Berserker or Madness Enhanced characters can speak, and seem perfectly rational except on specific topics, either a Berserk Button or a fixation.
- In interpretations where Ocelotte isn't real, Consumed King Oceiros in Dark Souls III is able to keep it together despite mutating into a vicious, insane half-draconic abomination by fixating on the delusion that he is protecting a son. During his boss fight, after a certain amount of damage, he appears to realise that Ocelotte isn't there, and immediately flies into a killing rage, losing the ability to speak coherently as he had done previously and simply lashing out savagely at the player character.
- Popular poster: "You don't have to be crazy to work here — but it helps."
- As Ursula K. Le Guin says, "What sane person could live in this world and not be crazy?"
- Many people in the Nazi concentration camps would still go through everyday routines (e.g., pretending to shave with their fingers each morning) just to try to maintain some sense of normalcy in their lives.
- The aforementioned Emperor Norton of San Francisco.
- There's a euphemism for PTSD among veteran soldiers known as "still sleeping with your boots on", as one of the more common but fairly benign ways the disorder can manifest is in a compulsion to wear shoes to bed, just in case of an unexpected enemy attack in the middle of the night, even months or years after returning from serving in an active warzone.