I think it was some kids at MIT who invented that thing... Leave it to some of the smartest people around to think of the most simple idea ever.
Radio Shack used to carry a 110dB alarm clock in their catalog. I had one in HS because I had trouble getting up for school... That thing would wake you up for damn sure... Ever hit the snooze? Not with that thing... when it went off you literally jumped out of bed... I got to the point in which my body hated it so much that I would automatically wake up just before it went off so I could avoid the trauma.