If you haven't already... then would you kindly play this awesome game. It may not be the scariest game out there (though it certainly has its moments) but find me a game that has more atmosphere, go on, try. Fantastic story, gorgeous graphics, quite simply one of the best video games I have ever played.
Across the board game of the year when it was released, and a shoe in for my game hall of fame.
If you haven't experienced Bioshock, but intend to, then I am envious, you're in for a treat.