History NightmareFuel / HarryPotterAndTheOrderOfThePhoenix

** The bell jar containing a bird's egg in an endless cycle of hatching, growing into an adult bird, regressing back into a baby bird and then an egg.

** The Death Eater whose head--just his head--is regressed to a baby. What the heck is this? And the fact that he moves like a zombie afterwards combined with this half-regression makes it unnerving.

* The fact that at the penultimate step on his book-long TraumaCongaLine, when Dumbledore is trying to reassure him about losing Sirius, Harry screams "[[PunctuatedForEmphasis THEN I]]--DON'T--WANT--TO--BE--[[OOCIsSeriousBusiness HUMAN!]]" The implication that he's been briefly turned into a ''DeathSeeker'', especially considering all the trauma in the first three books that he was able to cope with much more easily, is nightmarish ''beyond belief.'' Made even worse by [[HarsherInHindsight a prior chapter]] where it's noted that Umbridge is depriving Harry of "all the things that make his life at Hogwarts worth living."

* The fact that at the penultimate step on his book-long TraumaCongaLine, when Dumbledore is trying to reassure him about losing Sirius, Harry screams "[[PunctuatedForEmphasis THEN I--DON'T--WANT--TO]]--BE--[[OOCIsSeriousBusiness HUMAN!]]" The implication that he's been briefly turned into a ''DeathSeeker'', especially considering all the trauma in the first three books that he was able to cope with much more easily, is nightmarish ''beyond belief.'' Made even worse by [[HarsherInHindsight a prior chapter]] where it's noted that Umbridge is depriving Harry of "all the things that make his life at Hogwarts worth living."

* The fact that at the penultimate step on his book-long TraumaCongaLine, when Dumbledore is trying to reassure him about losing Sirius, Harry screams "[[PunctuatedForEmphasis THEN I--DON'T--WANT--TO]]--BE--[[OOCIsSeriousBusiness HUMAN!]]" The implication that he's been briefly turned into a ''DeathSeeker'', especially considering all the trauma in the first three books that he was able to cope with much more easily, is nightmarish ''beyond belief.'' Made even worse by [[HarsherInHindsigh a prior chapter]] where it's noted that Umbridge is depriving Harry of "all the things that make his life at Hogwarts worth living."

* A [[DefiedTrope defiance]] by the director[=/=]studio actually turns into another case of this: The scream Creator/DanielRadcliffe lets out during Sirius' death scene is muted in the film. It looks like an extremely convincing job of miming but research on the making of the scene reveals that Dan did do a real scream in the take, but the filmmakers deemed it too agonizing and made the decision to cut the audio. '''This was a PG-13 movie''' in a series that had already dipped into some disturbing material (the entire ending of ''The Goblet of Fire'', anyone?). ''What must that scream have sounded like? Brrrr.'' Doubles as TearJerker as it's been stated that Daniel's scream was so gut-wrenching made Creator/EmmaWatson (Hermione), Creator/BonnieWright (Ginny) and Creator/HelenaBonhamCarter (Bellatrix) cry. That said, it speaks volumes about Daniel’s skill as an actor that he could make other actors cry.

** The Death Eater whose head--just his head--is regressed to a baby.

* Harry's dream where he sees Arthur being attacked by Nagini, with the description of his ribs shattering beneath the attack. If Harry hadn't been quick, it may have been hours before Arthur was found. This scene is especially disturbing because the narration makes it sound like ''Harry himself'' is the snake with an uncontrollable urge to bite the man. It's also disorienting because it comes right after Harry was having an already-odd dream about Cho, and it's not immediately clear what's going on.

* A [[DefiedTrope defiance]] by the director[=/=]studio actually turns into another case of this: The scream Creator/DanielRadcliffe lets out during Sirius' death scene is muted in the film. It looks like an extremely convincing job of miming but research on the making of the scene reveals that Dan did do a real scream in the take, but the filmmakers deemed it too agonizing and made the decision to cut the audio. '''This was a PG-13 movie''' in a series that had already dipped into some disturbing material (the entire ending of ''The Goblet of Fire'', anyone?). ''What must that scream have sounded like? Brrrr.'' Doubles as TearJerker as it's been stated that Daniel's scream was so gut-wrenching made Creator/EmmaWatson (Hermione), Creator/BonnieWright (Ginny) and Creator/HelenaBonhamCarter (Bellatrix) cry.

** Bellatrix Lestrange, in particular, is creepy. She shows up with [[LaughingMad a mad cackle]] and an almost jovial air to her maddened self. Then Harry says Voldemort's name and [[MoodSwinger her mood abruptly shifts]], her eyes bugging out, and she bellows, "You filthy half-blood!"

* The scene near the beginning of the film, where Dementors suddenly appear and choke Harry can be unnerving to some.
* The aftermath of the Dementor attack in the book leaves Dudley ''so'' traumatized that he can't even stand up on his own. While Dudley has always been [[TheBully a jerk]], no one deserves to deal with a Dementor. After everyone is (mostly) okay, Harry finally wonders what exactly Dudley could've felt that was that terrible. What's worse is when WordOfGod reveals what the Dementors forced Dudley to see: ''himself'' as the bully he was until that point.

* The aftermath of the Dementor attack in the book leaves Dudley ''so'' traumatized that he can't even stand up on his own. While Dudley has always been [[TheBully a jerk]], no one deserves to deal with a Dementor. After everyone is (mostly) okay, Harry finally wonders what exactly Dudley could've felt that was that terrible.

* '''[[Characters/HarryPotterMinistryOfMagic Dolores Jane Umbridge]]'''. If there's anything scarier than NightmareFuel, she would be it. [[Theatre/AVeryPotterMusical "The Dementors are only afraid of one thing:]] ''Her.''" Here's a couple of things she's responsible for:

** Hell, the Department of Mysteries itself. A top-secret government agency that only those with the highest security clearance are allowed in, inside which all of the creepiest and most dangerous magic is studied. [[Wiki/SCPFoundation Where have we seen this before?]]

* Harry's dream where he sees Arthur being attacked by Nagini, with the description of his ribs shattering beneath the attack. If Harry hadn't been quick, it may have been hours before Arthur was found. On a meta level, this scene was likely where Arthur was going to die had Rowling not changed her mind. While most of the other deaths have been quick or off-screen, Rowling had obviously been prepared to not just sacrifice Arthur, but do so in an unforgettable, dramatic, gory way, with Harry watching it all in first person, which certainly wouldn't have been good for his already shaky mental health. And if you read the book, it's clear that Harry's nightmare is so bad that he even vomits down the side of his bed in shock after Ron woke him up.
** This scene is especially disturbing because the narration makes it sound like ''Harry himself'' is the snake with an uncontrollable urge to bite the man. It's also disorienting because it comes right after Harry was having an already-odd dream about Cho, and it's not immediately clear what's going on.

** Harry being forced to carve his own hand open with Umbridge's blood quill. In the film, at least, we have this line that summarizes just how monstrous and horrible Umbridge really is.

** The Death Eater whose head--just his head--is regressed to infancy.

* The Battle of the Department of Mysteries speaks volumes, considering how it involves a group of four 15-year-olds and two 14-year-olds fighting for their lives against the Death Eaters, and the various injuries they get are horrific by itself, but the most horror has to be what Hermione experiences. She is struck by a mysterious purple spell conjured by Dolohov, which causes her to faint and immediately crumple, showing all signs of someone being ''killed''. Harry is actually very, very scared in his narration that she is really going to die, although it fortunately does not happen. After the battle, it is noted that Hermione has to experience a lengthy recuperation process that involves drinking a lot of potions for several weeks. Oh, didn't we mention that Dolohov is muted at that time? Nonverbal spells are not as powerful as verbal, which brings up a FridgeHorror of what would happen if he was not muted at that time. It is quite possible that a verbal version of this spell is what Dolohov uses to kill Lupin in ''Deathly Hallows''. Rowling never elaborates the nature of this spell, unlike other high-end curses like the Unforgivable Curses or ''Sectumsempra'' or even ''Fiendfyre''. What we know is that it can be negated but not deflected completely and that it inflicts some sort of internal damage as from the outside the people hit by this spell is peaceful-looking. It sounds an awful lot like a ThemeParkVersion of the Killing Curse, which is not much better.

* Harry's dream where he sees Arthur being attacked by Nagini, with the description of his ribs shattering beneath the attack. If Harry hadn't been quick, it may have been hours before Arthur was found. On a meta level, this scene was likely where Arthur was going to die had Rowling not changed her mind. While most of the other deaths have been quick or off-screen, Rowling had obviously been prepared to not just sacrifice Arthur, but do so in an unforgettable, dramatic, gory way, with Harry watching it all in first person, which certainly wouldn't have been good for his already shaky mental health. And if you read the book, it's clear that Harry's nightmare is so bad that he even vomits down the side of his bed.

** And when you hear her suddenly screaming at the top of her lungs after someone makes too much noise in the books (tripping on something, running down the stairs, ring the doorbell), it's quite scary cause you don't expect that.