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In the Super Smash Bros. fanfiction "Smash Generation," Mario appears to have one of these after finding out that Dr. Mario dies in a year, since they're being visited by their future children. Yeah, it kind of slipped out. It didn't help that they were about to fight the zombie of said doctor. Bonus points to the writer who even referenced the site for the idea.
~~Homer~~ Omarn of Bart The General suffers a Heroic BSOD for most of the series as a result of seeing Marge having sex with his new neighbor Toadfish.
Omarn: Maaarrrgee...yer breakin' my heart... Maaaaaaarrrgee....
In the Undocumented Features Story Aegis Florea 2 Sumire Kanzaki is revealed to have spent three decades in a state of self imposed emotional catatonia shortly after the Hanagumi defeated the threat of the Invaders once and for all due largely due her belief that with The Imperial Floral Defense Force no longer being needed and The love her life Gryphon being gone and most likely never coming back that she no longer had anything to look forward to not even old age and death. She remains in this state until Kei reboots her with a What the Hell, Hero?[/] "The Reason You Suck" Speech that is scathing and insulting that her own pride demands that she finally snap out of it and get angry.
Harry has two in The Wizard In The Shadows. First, after Gandalf dies, when he a) loses it and the accidental magic lash out destroys the East Gate of Moria, then b) zones out until he runs into Haldir, who, after the latter says something ill advised, very nearly kills on the spot. The second comes after Aragorn appears to be dead. Harry gets detached and wants to search for him. Th�oden wants his most powerful military asset at Helm's Deep. Harry nearly slaughters them all.
- It should be noted that this version of Harry is vaguely unhinged at the best of times, after (by the time the story finishes), around six or seven years of constant warfare (including the events of Deathly Hallows).
In the well-known Star Trek fanfiction "Atlas" Kirk has one after Alpha nearly kills Spock just to devastate Kirk, a case of in universe fridge stuffing.
While the game itself does not include this, Knights of the Old Republic fanfic almost always pulls this if the writer is exploring the aftermath of The Reveal with a light-sided character.
- It may not include it, but the dialouge from other characters does imply it.
Subverted in Kyon: Big Damn Hero, when it looks like Haruhi is about to go into one of these, they intiate a Memory Gambit which prevents that from happening.
In the LXG fanfic series "The Private Diary Of Elizabeth Quatermain," the pacifistic title character has one of these when circumstances require her to kill someone.
In the Pok�mon fanfic Storm Clouds, Missy suffers a rather scary one when she returns to her world, only to discover that she's still an Eevee.
In the Firefly fanfic Forward, River goes through a couple of these, but the most intense is at the end of the "Hunt" story, after she accidentally shoots Simon, then butchers a Hand of Blue who shoots him shortly afterward. The look of shock on Simon's face afterward, with her covered in blood after having stabbed the Hand's face to the point that it completely unrecognizable as human, sends her into a complete Freak Out and causes her to run away in horror.
A notable example for Mass Effect fan fics is the story Exitus, in which its Commander Shepard suffers from an intense Heroic B So D just before they reach the Collector base.
Disgaea fic, Fail to the King opens with Almaz in one of these, curled up catatonic in the fetal position from the events of Disgaea 3's Almaz Ending. One Bright Slap that pounds his head into a crater later (what, you expected sympathy? It's the Netherworld!) and he's more or less good to go, though he has to take great pains to remain the Determinator and not slip back into despair when things, inevitably, get worse.
In the Dragon Ball Z fanfic Goku's Wish: The Return of Broly, Goku ended up suffering from the frozen in fear portion of this trope after a wounded Vegeta (Long story short, Vegeta, angered that Goku resurrected Broly, regardless of whether Goku gave him a clean slate and removed his hatred, due to feeling sore about Broly wounding his pride from their first encounter, got into a fight with Broly and ended up being completely beaten to a pulp, although not without Broly getting exhausted as well) turned into a Super Saiyan 3 before passing out. Gohan, after attempting to call out to his dad and shake him didn't work, tried to punch Goku in the cheek to get him to snap out of it. It doesn't work, despite hitting his dad hard enough to leave him with a large bruise on his cheek.
The Portal 2 fic Test Of Humanity has Wheatley break down sobbing and go into a depression after watching 2001: A Space Odyssey and becoming overwhelmed with guilt for his actions after seeing he was just as evil and heartless as HAL (and GLaDOS). He spends at least a chapter of the story in a catatonic state barely saying anything and wondering why Chell is being so kind to him after all he's done and why he even feels so guilty in the first place. He finally snaps out of it when he realizes the reason he feels so guilty is that he loves Chell.
Twilight Sparkle goes into one at exactly the wrong moment. Once she snaps out of it, it's too late...
Ditzy Doo freaked out when she started to recover her memories; that's because the fragmented images of her past made her think that she was a gangland enforcer who killed Dinky's parents for kicks when in fact, she was actually an undercover secret agent trying to warn them that they were targets of organized crime.
Happens to Pinkie Pie due to having a horrific nightmare where she killed her friends, causing her to believe a part of her is going to act it out. She's pretty much in a state of terrified shock when Rainbow Dash finds her, and reduced to a sobbing wreck after she's broken out of that. Turns out it was just a simple nightmare and nothing to worry about, and after some comfort and consoling from her friends, she's able to recover.
In Ace Combat: The Equestrian War, this happens to Flutershy and Rainbow Dash, the former thinking she killed a sentient being and the latter due to her encounter with an ex-friend Gone Horribly Wrong.
- Though the one experienced by Derpy in chapter 15 pumps the whole drama Up to Eleven.
Then Celestia suffers a massive breakdown when she hears that her sister had been killed (though she never was). What she looked like and felt◊ after seeing her body is not pretty.
- It goes From Bad to Worse when the news of Luna's death spread to Twilight and her friends. Fluttershy bursts into a torrent of tears, Pinkie Pie's mane and tail deflate again, and Twilight stares forward, with tears streaming from her eyes. This lasts up all the way to the funeral.
In the megacrossover self insert fanfic Sleeping With The Girls this happens to the main character when Mokoto tells him that she thought she'd killed him.
A fatal exception OE has occurred at BRAIN. The system has been shut down to protect your mind. Use Ctrl Alt Delete to reset your train of thought. Any unsaved information will be lost...
Paul in With Strings Attached goes through one of these for a night after he nearly loses control and attacks the Hunter for killing a bunch of wolves. The others talk him down. And in the morning, the Hunter unexpectedly apologizes, which helps.
In When There Was A Tomorrow, While recovering in the medbay from getting curb-stomped by a Hunter, Grunt realizes how much his arrogance has embarrassed himself and Shepard. He doesn't take it well when Shepard insists his injuries were punishment enough and demands worse. He eventually concedes to Shepard refusing to take him along on missions for the next few days.
Adelle suffered one after Sir Loin died in The Tainted Grimoire.
L in A Cure For Love after Light has Watari killed. It's later revealed that this reaction is helped along by Light drugging him.
The Axis Powers Hetalia fanfic Ice Cream is basically about England trying to help America, who is sufferring from a Heroic BSOD after 9/11.
In the Touhou doujin Though the Wind Cries, Suwako suffer's from a brutal case of this. And since she is the local god who normaly protects the area and makes sure that the rain fall the people that worships her ends up feeling the effects of it aswell.
In the Deliver Us From Evil Series, three different characters suffer this at different times:
- When Sherlock Holmes is injected with Culverton Smith's disease, the actual moment of the injection is depicted only by Holmes thinking Dear God, basically reeling from shock.
- Watson suffers an epic BSOD when he sees a ravaged corpse in the mortuary and believes it to be Holmes - Manly Tears and blanking out pretty much until he gets home are only part of it.
- When Patterson declares Holmes to be dead, Lestrade and Gregson don't believe him, at first. When the "truth" hammers home, though, Lestrade is very literally reeling physically, mentally, and emotionally - so much so that he can't re-enter the conversation until Patterson says something entirely insensitive and Lestrade delivers a very angry What the Hell, Hero?.
Inner Demons: All of the Mane Six, to varying degrees, when Twilight Sparkle is consumed by her Queen of Darkness persona and becomes the new Big Bad. And when she crosses the Moral Event Horizon, Fluttershy and Pinkie Pie take it Up to Eleven and actually cross the Despair Event Horizon (they get better later on).
- Fluttershy has another one when she thinks Trixie killed Rarity.
- Applejack breaks down completely when she realizes that turning her back on Twilight when she was scared of falling to darkness contributed to it happening.
- Apple Bloom has one as a result of the double whammy of accidentally killing Trixie and finding out that she's the Master of Harmony.
Earth And Sky: Pipsqueak slips into one through a combination of nearly being killed by the LaFish brothers, his self-perceived cowardice during the attack, and the guilt of all the things he's failed at in his life particularly his breakup with Apple Bloom catching up with him. Soarin' manages to talk him out of it and encourages him to get back together with Apple Bloom.
Pony POV Series: Twilight gets one during the battle against Nightmare Whisper, because she cannot bear to see how much Fluttershy is suffering. She breaks out of it by the end, though.
The Stars Will Aid Their Escape: Fluttershy has one when she realizes that not only does her ability to communicate with and calm down living things not work with the Dark Young, but that they're not angry or misunderstood — they are actively malicious, and they want to hurt her and the others.
- Spike has one following Twilight being rendered insane.
- Applejack, Rarity, and Rainbow Dash all slip into one after the Cutie Mark Crusaders are hospitalized. Dash's case is the worst, since Herald manipulated her into thinking it's her fault.
- Fluttershy has another one when Herald Breaking Lectures her.
- Pinkie slips into one when Nyarlathotep reveals that he's stolen the Cutie Mark Crusaders' souls. Rarity borders on one herself at the same time.
Mamoru has on in White Devil Of The Moon when he realizes that not only is Nanoha not the Serenity he remembers at all, she's found love in someone else.
In the Tamers Forever Series A Particularly nasty version of this happens to Takato once he finally merges with Chaos. Having achieved the full power of God, Takato is overwhelmed by the vastness of creation and suffers a crippling form of identity crisis. Why should he care about himself, his loved ones or existence at all, when each and everyone of those things can be destroyed and remade on a whim? Needless to say, it's rather disturbing To see Takato go from Nice Guy to Dr Manhatten Expy
It's almost a regular occurrence in Children Of Time, thanks to massive, multiple Trauma Conga Lines, Troubled Fetal Position included.
- Beth Lestrade in Children Of Time, having gone through a massive Trauma Conga Line, having emotionally abused by the man she loves, nearly raped, brutally killed... Now, Back from the Dead, she's reached Broken Bird status and is going through Heroic BSOD, curled up on the floor near Holmes's chair.
My Little Castlevania: Twilight's been on the edge of one ever since Shining was bitten.
- Sweetie Belle's been in one since the attack on Ponyville.
- Big Macintosh has one when he sees his father among the zombies.
  - Applejack has a worse one when she finds out about this.
- Rarity completely breaks down when Sweetie Belle is poisoned.
In Fallout Equestria: Pink Eyes, Puppysmiles gets a couple. First when she accidentally Kill Sats the Steel Ranger fortress that she thought her mom was in. The second when she finds her mom's grave.
In the Total Drama story, Legacy, the contestants react to seeing one of their own violently struck down by just standing there, seemingly with no idea of what to do.
- One contestant is completely unable to cope with seeing his campmate murdered, leading to his withdrawal from the game.
In the Sherlock fanfic Baker School Blitz, Jim's attempt to seduce John goes fairly awkwardly until Jim suddenly has a violent outburst and implies that he'll just assault John anyways. John's reaction is to completely black out. Warrior Therapist Dr. Donovan is able to get him mildly functional afterwards, where John reveals that he's had multiple HeroicBSODs because of his Social Anxiety Disorder.
A Future of Friendship, A History of Hate:
- Twilight has one when Ruinate abducts her friends at the beginning of Episode 2, on top of having defeated the Princesses in Episode 1. She's only pulled out of it when Ditzy Doo delivers a letter from Celestia (somehow), which reinspires her.
- The rest of the Mane Six as well later on in the same chapter; upon Ruinate destroying Twilight's soul, they all nearly give up hope, before Amity steps in and helps them restore Twilight.
- In Episode 3, when Fluttershy fears that Rainbow Dash will get herself killed in her rematch with Fury Cross, she breaks her promise not to tell the others about it. This makes Rainbow Dash explode on her and say that she hates her, causing Fluttershy to sink into depression. They make up later.
- Rarity slips into one in Episode 4 when she realizes that she's been completely ignoring her friends to spend time with Regal Rule. And it only gets worse when Regal turns out to actually be Megalos Tyrant. Her friends showing up and saving her obviously helps.
- Scootaloo has one in Episode 5 when her wish to be an adult blows up in her face. Which is exactly what Miserain wanted.
Keena & The Defendants Of Constan Magic Academy has this with Lily, after Eiko telling her that she can't have a romantic relationship with Michie due to Lily kissing Akuto on the events of the Daimao anime(Reason why was some sort of reward), even leading her to brief Sanity Slippage. She gets better, though, thanks to Michie.
Lind in Ah Archfall has one of these, believing that Jago was killed during an avalanche.
In Human Curiosity, England experiences one when the HCS forces him to look at Portugal's frozen solid "corpse". Hungary later gets one when she regains her memories, all at once remembering everything the HCS did to her, along with all the traumatizing experiences she lived through as a Nation. And pretty much every Nation has one when they learn just how many of their friends and family members the HCS "killed".