Exactly, I'm 21 and I still can't watch this without being creeped out for days after.Ju-On : The grudge
I couldn't sleep after watching it
I'm not sure if the Human Centipede scared me, or if it just grossed me out
That's it though, I can watch Saw, Freddy Kreuger, Texas Chainsaw, The Grudge, The Exorcist... all of that stuff really doesn't get to me.
I heard The Shining is really scary though... I haven't watched it.