Twilight
The first half of this movie is probably the most fun I've ever had watching a movie. The characters are strange, ridiculous, and unrealistic to a degree that comes across as absurdist comedy. If you enjoy it on that level, you are going to have a fantastic time (although when you get to the second half it gets more into like action/fantasy kind of stuff and it's less fun)
I can't believe anyone ever thought this was a good movie though? Like surely, people have always been watching this like they watch The Room, going in there for a "so bad its good" experience. If I tried to put on my thinking hat and "critique" this it surely would be a 0.5. However, on a pure enjoyment factor this fucking rocks. I just can't imagine anyone sitting through this and taking it seriously as a romance/fantasy.
Edit: I just had to bump up my rating after watching more of the saga. The magic here is unrivaled. In later movies, there can sometimes be a little bit of chemistry between the actors, but this movie remains untainted by anything of the sort. It's not enough to say every line here is delivered like the actors have never met each other before; they're talking like they've never met ANYONE before. The only other thing like it is The Room, which in my opinion is not nearly as funny.