Here's a hilarious video of reactions of people playing one of the scariest games ever made.
[YOUTUBE="loSzpvq73FY"]Amnesia dark descent[/YOUTUBE]
I dont think that game looks that scary to be honest, I read about it, is it a lovecraft or psychokiller game? The only game I thought was scary playing was Silent Hill, also some of the sequels, and the Project Zero games which aimed to be deliberately more scary but unless you allow yourself to be drawn in and suspend disbelief you're not going to experience any fright really.
When I play games I tend to get more worried about losing an hour or mores play time between save points and have to repeat play especially if its not got great gameplay.