Okay i just stole this off off psphacks, but its REALLY COOL
Before you do this, make sure you listen to it with earphones or else it WILL NOT WORK!!!!!
here is the link , it sounds like someones behind you
I promise this isnt a screamer or something, this is real!!
REMEMBER YOU MUST BE WEARING EARPHONES!!!
i got this from psphacks, all credit ges there