I'm pretty sure it was an old Fortune 500 - they packed the payout tray with ammonium nitrate and then retreated to a safe distance, where the lucky fella had the pleasure of doing the business with a giant plunger.
Machine explodes: the front glass travelled furthest while the door and all the wooden sides of the cabinet were simply burnt to ashes.
I'm considering blowing up a Prize Fighter as a result of watching this show.