+Ring
+Schindler's List, especially disturbing watching it as a Jew.
Absolutely, Marcellus.
Other disturbing, but good films I've seen, are as follows:
Gloria, starring Gena Rowlands, as a tough mafia moll who befriends and helps a 6-year-old Puerto Rican boy whose parents get knocked off by the mob, and they end up going on the lam together. it's funny in some parts, although rather sadistic on the long run.
Ground Truth This, too, is a disturbing film, but is a way to make people aware of what our soldiers coming home from Iraq have had to go through while in Iraq, and back at home.
There Will Be Blood is a very well-done film, worth seeing, although rather sadistic at times.
No Country For Old Men: This, too is a well-done film, but not for the faint of heart. Rather sadistic, but well worth seeing, imo.
Deliverance: This movie is not only disturbing, but brutal beyond belief and totally sadistic.