The Suffering - I'm playing it right now :)
You try to escape a mad island of a penitentiary for death row that has hosted many different executions.
All the enemies you face have suffered a particuliar death - like decapitation, fired by a firing squad, lynched, buried alive, etc.
It's very maddening and lunatic and you can finish the game with three different endings: Good, bad, or plain insane [using insanity power a lot of transforming into a monster for a while!]
The game is pretty long, and the scare factor is very high, but funny aswell as you can see countless hanged up the ceiling when you encounter the Nooseman.