Basically this guy picked up a weird cartridge of Majora's Mask from this creepy guy that lived near a garage sale. The cartridge seems to be possessed or something, and is driving the person posting these messages crazy.
Personally I really like this, makes Majora's Mask seem a little darker, and it already is one of the darkest Zelda games out there.
To my understanding, everyone knew this was a joke, although I still think it's interesting.