Wow, I thought I was the only one. I want to punch him in his stupid I-can't-download-and-app-to-screen-lock-my-mouse face...
I didn't find Slender nor Amnesia scary, I found FEAR 1 and it's expansions Scary. Dead Space gave me the Heeby-geeby's as well.
I'm wondering the same thing. Amnesia was the first game I ever played where it was a struggle to play just because it was so damn scary. I played in short bursts and it was an incredible achievement for me to finish it.
And I like scary games. The Silent Hills and so forth. Amnesia was just insane.
Anyone ever play the Project Zero/Fatal Frame games? I think they're probably as scary as scary can be.