Weird, Disturbing, and/or Controversial movies?

So I was lurking 4chan a few days ago and there was this thread about 'list the most disturbing movie you have seen' or something like that. So I just wanted to know what are one of the most disturbing, weird, cult, and/or controversial movies you guys have seen? It doesn't necessarily have to be scary but it could be part of the horror genre.

Some movies I have finished watching or plan on watching because of 4chan are
Visitor Q (I actually liked the song in the end o.0 I should look more into this director he makes a few controversial movies [Takashi Miike])
Gummo
Begotten (I could only watch the first 5 minutes because it was blurry as shit so better off reading the plot summary)
Phantasm
REC
Happiness

Those are just some that I have seen or plan on watching, I can't really think off the top of my head right now, but the list should give you an example, discuss?

Does Ginger Snaps count? It was pretty disturbing.

Teeth - about a female with teeth lining her vajayjay.

Donnie Darko was weird, but hauntingly cool, one of my faves.

Braindead/Bad Taste/Meet the Feebles.

Some classic ones.

Hard Candy.

A Clockwork Orange.

Requiem for a Dream

"Ass to Ass!"

Sometimes they come back.

All under the "weird" category

~Killer clowns from outer space

~The Ice Cream Man

man these were freaking weird!

That's the only scene I can remember

Not even the part where the refrigerator tried to eat the Mom?

Ok, it's not the only one, but I immediately remember that as soon as I hear the name.

I kinda think that was the point of the scene, anyway another weird movie buy the same guy is:

Pie.

cannibal holocaust.

...ugh...

one hour photo.
one of the robin williams classic.

How could I forget " Idle Hands ".

ahh cannibal holocaust...

Eternal Sunshine of the Spotless Mind

I love that movie.