Recommendations for a movie that deeply impacted you/lingered on in your mind for days

I’m interested in movies that’ll either deeply impact, traumatize, or will get stuck in my mind after watching it.

Something that perhaps ended up manifesting in your dreams after you watched it, or it was impossible not think of during the day.

It doesn’t necessarily have to be a horror or surreal film either (though it could be!), but lately I want something that may really linger on and get my mind overworking.

Please, no recommendations for Salo haha

Edit: omg thank you all for dropping so many suggestions! Can’t wait to get to watching these.

Last night I made this post and put down my phone to watch Demon Pond (complete blind pick) and it influenced my dreams. Not traumatizing, but hauntingly beautiful and hypnotizing!