I've watched Saw and the story was LAME. I've watched Salo, the story was sick. That movie is only good for people with mental disorder. My wishlist: Last House on the Left
I don't know if it's as disturbing as all these, but my vote is for the Japanese movie "Suicide Club"....frickin' eery.
I really hate THE SAW. It made me sick of meal too. yes,..it is a good Question. what about zombie? I think all of Final Destination didn't make us sick of meal. I watched it. wow,.. really,.. i didn't eat after watching. really scared,.. eating a baby,.. it is usual, you must watch SAW movie. more terrible one.
The only good horror movie that scared me was the Exorcist - which was pretty disturbing. Horry movies today just go for cheap 'make you jump' type scares.
I saw some weird French movie that was just extremely messed up. I can't recall the name of it though.
Update: I've watched Last House on the Left, the original, not the remake. I saw the cut version. There's nothing disturbing. Maybe the uncut version? Irreversible? Monica Belluci gets raped?
Hostel for me was totally effed in the head (yet strangely I couldn’t stop watching). Another one along the lines of I Spit on Your Grave is an indie film called A Gun For Jennifer about a girl turned vigilante after she’s mugged and raped her first night in NYC. It was actually pretty good, too bad they had trouble getting distribution for it.