Any grim, dark, gruesome, disturbing, bizarre, and controversial movies ever seen?

[BlakeNES]

Here's the list of movies that have those aspects in the title:

-Salo (or the 120 days of sodom)
-Cannibal Holocaust
-Gummo
-A Clockwork Orange
-Tetsuo: The Metal Man
-Altered States
-Grave of the Fireflies (ANIME)
-Heavy Metal (ADULT ANIMATED)
-Akira (ANIME)
-Watership Down (ANIMATED)

That's all i could think of, so what are your movies?