Hands down, Requiem for a Dream. That movie is so good but can only really be watched once.
ASS TO ASS!
Also the scene where Jared Leto’s friend is shooting up makes my skin crawl.
The french original of Martyrs. That movie really lived in my head for some days.
I think you should see it without knowing anything.
Just be sure that you can handle some fucked up shit.
Grave of the fireflies
Even worse, it’s based on a true story. (The author preferred the movie’s ending)
It’s on my rewatch list since it’s been about twenty years, but I still can’t bring myself to doing so.
It’s an incredible movie. I’m not sure how much you should know before going in, but I’ll say this: Don’t be fooled by the fact that it’s animated - by the same studio as “My Neighbor Totoro”. (The two movies played as a double feature because not showing something lighthearted after Grave of the Fireflies would have been criminal negligence.) And the other comments are right - It’s not something you’re likely to be able to watch again anytime soon.
A Serbian Film.