Pete isn't looking where he's going, and is hit by a car. Enter Patrick Stump, a minion of Beelzebub who has come to collect Pete's soul. The thing is, Patrick isn't really cut out to be a devil.
Pete was rich. Actually, that was an understatement; Pete was filthy rich. His inheritance had ensured that he'd be well taken care of for the rest of his life. He had a staff that was paid to cate...
Basically, Patrick Stump is the devil who hath come to claim the soul of Pete Wentz...in exchange for doing his homework for him.