The trailers for the DS game "Nanashi no Game." I don't know if Square has any plans to release it in English--they really ought to, because the game is frickin' scary, a lot more than I expected. It's kinda like "The Ring" meets "crazy game developers (with a not-so-subtle message that working too many hours drives them insane)"--there's a cursed DS game that, if you play it, you die within one week. Your character played it, and you're trying not to die, even though you have ghosts--including the ghost of your best friend and her boyfriend--actively trying to kill you. You have to play the 'game-within-a-game' at certain points, and you know when ghosts are around you because the cursed-game will go extra glitchy and the sound will screw up. Honestly, the game-within-a-game creeped me out more than the ghosts-trying-to-eat me bits, because they were waaaaaay more of a mind-screw.
Trailer 2 [http://www.youtube.com/watch?v=Imp_UKaQi-0]--the ending to this one really made me go "Gyaaah" the first time I saw it.
Trailer 3 [http://www.youtube.com/watch?v=LskaSyCM5mQ]--this one shows the sound going wrong really well.