Amnesia, the Dark Descent is the scariest video game ever made. I can't stress how horrifying it is. For proof, here is a video of the reactions of people playing it:<br />
Deadspace was pretty creepy but i think Doom (360) was a really powerful in the new wave of Freakout gaming. 9/10 for its time.
Land of the dead.
House of the dead
Bioshock, on the hardest difficulty ( i like to run through stuff) (by stuff i mean traps and explosives :(