Requiem for a Dream is an incredibly powerful film that is worth watching once, then never again.

I've seen most of the movies mentioned here 🫠

IMHO, A Serbian Film and Human Centipede 2 have some of the most disturbing scenes I've ever seen. Realizing that they are made for shock value kind of make them laughable though.

SALO is often mentioned in lists of fucked up movies, but it's really not much. There's some poop eating, light rape and someone's tongue is pulled/cut out. It might have been shocking back in the day.

Irreversible made me feel nauseous and had an unsettling feeling from start to end. (Made me vary about Climax, which kind of have a similar feel, but is only fucked up to a much smaller degree). That one for too long scene that just foes on forever makes it the most disturbing film I have ever watched.

Heriditary has some fucked up scenes too and truly scared me. (But Midsommar bearly made an impression on me. Bearly).

Requiem for a Dream made me feel bad about drugs.

Bone Tomahawk kind of seems like an average action/adventurish movie in a western setting until... stuff happens.

Also worth a mention are Martyrs, Ôdishon, The Woman, Inside, The Girl Next Door (not the comedy) and either versions of Funny Games.

May have forgotten some.

(I have no plans to watch any of the Terrifier movies).

Edit: Totally forgot The Heart is Deceitful Above All Things somehow. Man, that is one fucked up movie. "Play with me Daddy".

Grave of the Fireflies. Not the same type of fucked up, but I don't want to watch it again!

Old Boy is a movie that constantly has you on edge because you can tell something is going horribly wrong, but you’re not sure what it is. Once you find out, the whole thing is fucked six ways to Sunday.

The original Korean Old Boy from 2003 was pretty fucked up. Great watch but the ending was uh... Yeah. Kinda messy.

There's a movie called A Serbian Film that will make the everyday person lose their marbles. Not my friend apparently, he's like "come on in and watch this movie with me that I'll proceed to use to test my manliness". So me and my other friend walk in to him sitting in a dull pebble chair about to consume a bowl of carolina reapers as his "movie snack". She could not sit through the first segment, and I think I had trouble halfway through, but there he is, just absorbing what everyone says is the most graphic movie of all time.

Cannibal Holocaust (1980), Eraserhead (1977), Underground (1995), The Holy Mountain (1973), Salò or the 120 Days of Sodom (1975), Ichi the Killer (2001), Inside (2007)

Recently, I watched and really liked the japanese movie Ritual (2000).

I watched all of the above with awesome German dub.

I haven’t seen anyone mention Come and See yet, so that one.

Super is a movie that was fucked up largely because you don't actually expect it to commit so hard to the premise.

Amazing movie though, one of my favorites. A lot of famous people starring as well, especially for such an unknown movie.

Threads (1984)

The fault in our stars

What an absolutely awful movie. I was prepaired to shed a tear but I wasn't expecting it to ruin my entire week. I wish I had never seen it.

The Girl Next Door (2007) Is a true story about an abused girl. Very disturbing

It depends on your definition but Visitor Q by Takashi Miike would probably offend most people. His other films can be rather out-there too.

Also the splatterpunk films of Yoshihiro Nishimura rank high. If you want a distilled taste, see "Z is for Zetsumetsu" in ABCs of Death. Otherwise, try Tokyo Gore Police.

Tetsuo: The Iron Man actually caused me to have palpitations, and it's rare I have such a physical reaction to a film.

And that's just Japan, you could always try something like Adam Chaplin.

However, they tend to be so over-the-top that they are entertaining. If you want to watch something that's an ordeal to get through then you could start with the August Underground films. There are others in the same vein like Tumbling Doll of Flesh or Guinea Pig: Flowers of Flesh and Blood. You can then grub around looking for similar films as there's always someone out there trying to be more appalling. However, it's not really my cup of tea - the worst I've seen in the cinema is probably Necromantic last Valentine's Day, which got quite a few walk-outs, although my main issue was it seemed far too loud.

Phil Tippett's Mad God. It took the man like ~30 years to make the most fucked up, fever dream of a stop motion movie. I don't know what would be worse, watching it sober or high on anything.

I like to imagine, that like Stephen King, he did some wild drugs. But instead of writing a book and moving on, he just kept getting absolutely zooted for 30 years until this movie was done. Because that is the only reason that would justify that movie's creation.

Martyrs

I Spit On Your Grave was dark as fuck, Them, and something about an Australian road train that drove itself. I think it might have been called Road Train. It was very weird.

Audition (1999)... I haven't watched it in 20 years but holy shit it is definitely in my collection of scary memories

Eraserhead

Kids. Saw it years ago. No interest in ever setting it again.

Come and See is up there. Kids as well.

The Naked Lunch is a stout contender IMHO.

Splice, for some reason.

Salo, or the 120 Days of Sodom

For me it was "Dear Zachary". Mostly because it's a documentary, not because it's gory or anything. It's just a heart wrenching documentary.

A Serbian Film, but I don't really remember it now. Oh, and the masturbation short film in the ABCs of Death.

Hostel probably isn't the most fucked-up movie I've watched, but it's the one that affected me most strongly. I felt physically sick during the scene where

The Wall

You guys know something about ponies? Imagine those, but shaped as humans. That idea basically horrified me so much that I decided the entire franchise it was a part of was not worth my time.

I am of course talking about Equestria Girls.

I think it was "The number PI" or what the movie was called. Very schizophrenic, including lobotomy.

Once we were warriors. Great disturbing moving film

Probably Mordum since it was

1. Shot to look like amateur/found footage a la Blair Witch
2. Had a dude get his dick cut off. Yeah it was special effects but they didn't do any cutaway or implied. Kept the camera on that dick.

https://en.wikipedia.org/wiki/August_Underground%27s_Mordum

Baby Reindeer. Not a movie, 7 episodes, but one of the more fucked up things I've seen in a while.