Amen.
Time Bandits - Gave me nightmares, the bit about him touching the black matter at the end…
Gia - Screwed me up for about a week, not that the film is particularly disturbing in itsself, but I related in weird ways (no I am not a supermodel).
The Big Blue - I forget why, but this sent me off into an all night crying jag about the fact that humans are disgusting foul beings and the world is a horrible place.
Boys Don’t Cry - Didn’t freak me out as much as these others (perhaps its part of growing up?), but everyone who left the cinema after the film just stood around outside in a daze, noone really knew where to go or what to do next. Shellshocked more or less.
Requiem for a Dream
Heavenly Creatures
Rosemary’s Baby
Dead Ringers. VERY VERY CREEPY!
Parents - a child’s worst nightmare about his parents comes true. The age of the kid is what gets me. At that age kids trust their parents implicitly. This movie still creeps me out.
Rosewood - I’d never heard of this incident before. That the movie was based on a true story… ::shudder:: Another shellshocker of a movie.
I can live quite happily never seeing Happiness again.
The Cook, The Thief, His Wife and Her Lover – never again.
Naked Lunch – never again.
Willy Wonka and the Chocolate Factory – the tunnel scene made me afraid of the hallway at my house for YEARS. I can watch it now but I still have to close my eyes during that because the chicken thing really upsets me.
Sophie’s Choice – I’m on medication to make me NOT depressed, thank you.
The original version of The Vanishing.
The old British TV movie Threads, about a nuclear war and its aftermath.
Pet Sematary-the part with the flashbacks to the wife’s older sister…shudder
Grave of the Fireflies.
Kids was possibly the most disturbing movie I’ve ever seen because it was so damn accurate. I’ve known people like the dimwitted, drug addled, AIDS spreading, bastard rapist star of that film, Casper. It makes my blood boil just to think of him. One of the few movies I literally had difficulty watching.
As for Trainspotting, Se7ev, Requiem for a Dream, and A Clockwork Orange I never found them that disturbing, in fact except for Requiem I have them all on DVD. I guess the thought of a small army of 15-year-old punks with no parental control and no inhibitions scares me more than adult crackheads, thieves, and serial killers.
I second the original The Vanishing. If you haven’t seen it or are only familiar with the wretched American re-make it’s well worth a rental. It’s one of the best psychological thrillers I’ve ever seen and I will never, ever watch it again.
Ditto, for Henry: Portrait of a Serial Killer. The dead-eyed performances of the lead characters and the minimalist direction presents the horrific events in such an unblinking way that I felt physically ill after watching it. A friend of mine never made it past the video-taping scene. It’s probably one of the best horror movies ever made.
The Blair Witch Project also really got to me. I know a lot of people thought it sucked or was over-rated but I bought into it completely. The final scene haunted me for days afterward and I certainly didn’t get much sleep that night.
Un Chien Andelou. The eyeball scene. 'Nuff said.
Se7en was pretty disturbing. Sloth is the most memorable scary-scene I’ve ever seen…that alone ranks it up there.
Heavenly Creatures- my favorite movie of all time. So brilliant. There really is a fine line between genius and madness.
Suspiria, a Dario Argento film. That one scene where the two girls are behind the sheet where the headmistress is.
When I was a lot younger (and even now probably) The Witches…just because.
The Exorcist. Lots of gore doesn’t usually get to me, but the way they managed to make Linda Blair go from a sweet innocent kid to an utterly creepy creature…just got to me in ways I can’t begin to explain. 
Actually, Casper was the one that (possibly)got AIDS at the end of the movie after having sex with the girl that was passed out(so the rapist part still applies). I believe it was his friend who was obssessed with virgins that was the AIDS-spreading bastard. they were both pretty dimwitted and drug-addled though. Casper’s character was almost endearing in his stupidity up until the end, though.
I’ve seen about 1/2 of these movies and don’t find them particularly disturbing, but the one I have to agree with is Kids. It’s the most disturbing movie I’ve ever seen because the movie channel I saw it on said it was a documentary, not a mockumentary. I’ll tell you, it’s a lot more #$@&ed up when it’s presented as being real.
Session 9 ended up being a lot more disturbing than I was expecting, too.
The newer version of “Lolita,” very simply because Jeremy Irons still seemed so sexy when he was lusting after a prepubescent girl. Ditto for “Dead Ringers.”
Just for good measure, thow “Donnie Darko” in there as well.
Ditto on that. Zelda, she was extremely disturbing. With her mangled back and scraggly hair and all.
American History X was very disturbing, very scary, and very realistic. My boyfriend bought that movie and watched it, and he tried to get me to watch it again with him a few days later. No thank you! Once was enough for me.
I’m sure there’s a TON more movies, but I just can’t think of any of them right now.
Acts of senseless violence disturb me a lot.
The scene from Kalifornia where Brad Pitt (I think it’s his character anyway) goes into the old woman’s home and she says she doesn’t have a husband, and then Brad goes and finds the old guy back in his observatory or something, and the guy happily says, thinking his wife has just entered, “Ooh, look what I just found…” Cut to Brad re-entering the living room with a bloody golf club, telling the woman, “You’re right. Now you don’t have a husband.”
That was HORRIBLE. I had nightmares about that scene for weeks, I kid you not. I just can’t deal with senseless violence that destroys people’s lives that way. I had to turn the movie off at that point.
Similarly, The Sixth Sense bothered me, but not for the reasons you might think. The scene that disturbed me for a long time after I saw the movie was the one right at the beginning, where the crazy guy breaks into their house and shoots Bruce Willis.
That’s my worst nightmare. Literally. In fact, these days I refuse to go see a movie where it’s even remotely possible that a child or anyone’s loved one is going to be seriously hurt. This extremely limits my movie-going opportunities, but I just can’t handle the stress. Sigh. Maybe it’s a sign of impending old age.
I’ll second “Salo,” but not because of its graphic depictions of the sadists mistreating their victims, but because of how the victims allowed themselves to be mistreated.
Oooh, I loved Heavenly Creatures and Farewell, My Concubine!
The most disturbing movie I have ever seen is Baby of Makahn, directed by Peter Greenaway (The Thief, the Cook, etc guy). The movie is set in Restoration England and the premise is that no children have been born in 20 years. Finally, one couple does have a baby, and the film is all about how various people and factions try to manipulate the baby for their own purposes. That makes it sound much more straightforward than the movie actually is. Not only is it an incredibly creepy premise, but very, very disturbing things (death by repeated rape, etc) happen to several of the main characters. Jesus, it was disturbing.