So there was this guy, and he bought a Majora's Mask cartridge from a creepy old guy, and it had wicked scary glitches in it, like Link would burst into flame while the Song of Healing played backward, and ...
Someone posting to 4chan's /x/ board (its paranormal forum) has concocted a whale of creepy urban myth that lacks only a campfire, flashlights under the face, and someone's cousin's best friend's stepbrother. It is long, but the gist of it is that the teller encounters a creepy old man, who gives him a strange, blank Nintendo 64 cartridge with "MAJORA" sharpied on it. He takes it home, plays it, and deletes a gamesave marked BEN.
Very strange, very threatening things then start happening, and while I think it's nothing more than a ghost story, it's very, very well written. It'll have you on the edge of your seat, grabbing your monitor and screaming "JUST TURN THE GODDAMN N64 OFF!!!!" And it even comes with three videos, attached below.
The entire story may be read here (via Joystiq). I expect to see some expert damn mythbusting in our comments - or maybe, maybe the haunting is real ...
Haunted Majora's Mask Cartridge [Zelda Informer]