I can stomach quite a bit. I've seen lots of films that could be considered disturbing--some I liked, others I didn't, most I could take or leave. I didn't think requiem for a dream was all that messed up. Storytelling had a few good moments but overall I think it was crap. Its dark, not disturbing. Same thing with Rules of Attraction. Bizarre, but not a good bizarre like Clockwork Orange. I consider myself a film junkie, yet I'm embarrassed to admit i'm not familiar with Araki or Korine. Havent seen Trouble Everyday or Boxing Helena. I'm getting to the point that if its a "shock" movie, i'm probably not all that interested cause I like being intelectually stimulated and inspired by film, not disturbed and confused. With that said, I did like The Piano Teacher 'cause what's her name was incredible, but I didn't *love* it.
Hands down, the most disturbing film I've ever seen is Water's Pink Flamingos. Sex with corpses, bestiality (real), self-mutilation, (real) animal mutilation during sex, and I think there was some incest as well. Interesting, but certainly not enjoyable.
If I know a film is going to be disturbing, I don't really go for enjoyment, but really just out of interest in keeping up to date with independent film and to be aware of what all is out there.
"Is this what you want you want to do with your life, man? Suck down peppermint schnapps and try to call Morocco at 2 in the morning?"