If you are into horror films, this interactive flash game should make you scream with giddiness. It's pretty professionally done, as it is apparently sponsored by Doritos (odd, but don't ask me why).
long dark corridors - hallmark of the horror genre
For the best scare, make sure you switch off the lights and put your headphone on. Oh, you'll also need a working webcam and a microphone to complete the game.
Good luck.
P/S : IMPORTANT! the game will only run between 6pm to 6 am, though you can change your Windows clock to trick it into running, but whats the fun in that?
