Well, almost all of them ...
I'm such a big wimp, YET, there are times where I would actually love to watch them. Usually with a friend and I would end up enjoying them. Well, kind of, when the story is really good.
Also! When it's all just jump-scares and overly dramatic and loud music, then I'd feel like wasting money (and time) just to be scared inside the movie theatre. As if life is not hard enough. :S. Besides, the super cute and light-proof cardigan will not help by then as it is not entirely sound-proof.
So scariest movie? (almost) ALL horror movies! You name them!