David Hasselhoff
In 2007, a drunken David Hasselhoff laid on the floor in his Las Vegas hotel room and chowed down on a cheeseburger. His daughter caught the whole hilarious thing on tape.
Orson Welles
In the 1970s, Orson Welles filmed a commercial for Paul Masson champagne in which the Oscar-winner slurred his words and completely zoned out as the director called for action.