The one that has disturbed me lately - I haven't been disturbed in awhile either - was Dear Zachary. I'm still scarred from that thing. :-(
Other than that, I agree with The Strangers, and Alpha Dog. Ugh.
I have to add though, when I was like 5 we watched one of the 342345 Nightmare on Elm Street movies and my cousin (who was like 20 at the time) made me go to the bathroom with her because she couldn't go alone. She thought Freddy was gonna get her. :lol: Even at 5 I was like WTF am I gonna do?! I'm 5 numb nuts! :lol: :lol: