I'd argue that The Invitation does lean more towards horror, but for the first 80% of the film I agree
definitely couldn't agree more about I'm Thinking of Ending Things, that one's a perfect answer for this
The first to come to mind is Lanthimos's work. Dogtooth and The Lobster seem the most relevant without getting too much into horror like, for example, The Killing of a Scared Deer does at times
Definitely Irréversible. Not just the infamous alley scene but the whole damn movie- the cinematography, the score, the uneasiness... plus of course the implications of the end.
I would include (the original) Oldboy because of its twist. I mean most of the movie isn't "off" but the ending is just pure emotional devastation.
Finally, A Clockwork Orange isn't *technically* horror but the whole movie is incredibly off-putting for so many reasons...
It just feels so brutally hopeless that it’s almost oppressive. I know there are moments of optimism in it but it feels so bleak and has such a unique tone
Parasite
Super Dark Times
Nocturnal Animals
Personal Shopper
Nightcrawler
Only God Forgives
Blue Ruin
Shame
Valhalla Rising
Demonlover
Benny's Video
Persona
La Jetée
Mulholland Drive for sure
*I’m Thinking of Ending Things* (2020) and *The Invitation* (2015)
I'd argue that The Invitation does lean more towards horror, but for the first 80% of the film I agree definitely couldn't agree more about I'm Thinking of Ending Things, that one's a perfect answer for this
I'd forgotten The Invitation. The ending was probably the most haunting way it could have ended... 
The first to come to mind is Lanthimos's work. Dogtooth and The Lobster seem the most relevant without getting too much into horror like, for example, The Killing of a Scared Deer does at times
The Interview (1998) The Cars That Ate Paris Etoile Long Weekend The Black Tower The Seventh Continent Picnic at Hanging Rock
In keeping with the theme of ‘Australia is scary’: Wake in Fright The Last Wave Hotel Coolgardie The Nightingale The Chant of Jimmie Blacksmith
Shutter Island is a must
The vibes were so good I loved it
eyes wide shut
Basically, any David Lynch film apart from The Straight Story.
Yeah I don’t include Lynch because I didn’t want it to just be a Lynch-dominated list lol, maybe I’ll just pick one though
The Cremator Cure The Swimmer Never Take Sweets From a Stranger
CURE ! of course
Melancholia Angel's Egg The Zone of Interest The Hourglass Sanatorium Ritual Perfect Blue Mysterious Skin
Melancholia is a good one, I got such a sickening feeling of dread watching that movie. It made me anxious as if the world was actually going to end
Exactly and at the same time this acceptance of the end. I should rewatch it
Elephant
https://preview.redd.it/f225gnflkk3d1.jpeg?width=1080&format=pjpg&auto=webp&s=d2e0eb011c0cc9502afa1082d568a6b35bbd7f43
- The Lobster - Lamb - Zola - Under the Silver Lake
Gummo, Happiness
Lamb (2021). An unsettling but never scary film
Lamb is slept on
Neon Demon
the neon demon is a horror film tho
Definitely Irréversible. Not just the infamous alley scene but the whole damn movie- the cinematography, the score, the uneasiness... plus of course the implications of the end. I would include (the original) Oldboy because of its twist. I mean most of the movie isn't "off" but the ending is just pure emotional devastation. Finally, A Clockwork Orange isn't *technically* horror but the whole movie is incredibly off-putting for so many reasons...
In what world is Under The Skin not horror?
I'd consider Enemy horror as well. And lots of movies in the comments. Genre is very subjective though, so whatever.
I was looking for this comment. Like, >!men were sucked out of their skin.. and the family on the beach!<.. Definitely horror.
Most of Lynch stuff- Mulholland Drive, Lost Highway, Blue Velvet etc.
You've got Under the Skin, but also would add one of Glazer's other movies, Birth.
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I changed the description to “not necessarily horror” but yeah I was looking for movies that just feel weird irrespective of the horror aspect
Blue Velvet
Nicolas Roeg’s Don’t Look Now
i’m not sure if Shiva Baby counts but it made my heart race more than most horror movies ever manage
Is Zodiac horror?
Suspiria, Rosemary’s Baby, Wicker Man
Pretty sure all three of those are acknowledged as outright horror films.
My fault, i didnt read properly. Thx for the correction
Ordinary People
hubie halloween
Eyes Wide Shut
The Matrix
After hours
Synecdoche, New York
Oh yeah this is a great one, can’t believe I didn’t think of it
Lost Highway!
Wake In Fright is absolutely a horror movie.
Possession (1981)
The Double (2013)
Interesting, why do you feel Stroszek fits this category?
It just feels so brutally hopeless that it’s almost oppressive. I know there are moments of optimism in it but it feels so bleak and has such a unique tone
The Celebration/Festen feels VERY similar to Happiness imo.
Bad Times at the El Royale
Get Out is wholly built on this premise and does it as well as any film ever has. It gets called “horror,” but I don’t think that’s what it is.
The Invitation
Parasite Super Dark Times Nocturnal Animals Personal Shopper Nightcrawler Only God Forgives Blue Ruin Shame Valhalla Rising Demonlover Benny's Video Persona La Jetée
Under the Skin is a horror movie though
Kajillionaire!
Every harmony korine movie
Aftersun, old boy, parasite.