Recommend me some horror movies where you don't know what it's about at first.

Like I was watching Men yesterday (did not like how it turned out, anyways) and I went in kinda blind and didn't know what it was about and it was cool at first. So I was wondering what other movies do that, where you don't know what it is about and it is a vague mystery at first with odd and strange things happening but you don't know what it is aiming at, you might not even know if it is supernatural or not. Other examples would be Barbarian and Get Out.