I don't know - It might be because I'm sick, or because I let it get in my head, but Paranormal Activity spooked me out at night. I was sick so I woke up a few times, then I kept imagining somebody was behind me/in front of me/at the foot of my bed (I tend to do this regardless of scary movies - I'll imagine something watching me, and in the dark, it keeps increasing in how it manifests in my mind until I start to actually freak out)

I don't like fixing it - it's pretty cool to wallow in non-logical frivolousness.

No other film can do that to me because most hollywood horror has a physically manifested entity as the antagonist, and unless I see the guy/bat/thing in front of me, I won't be scared by such movies.

[this is also why the movie リング scares the pee out of me