"I'll tell you what's wrong with it. It's dead, that's what's wrong with it." For those who believe the ancient Greeks thought of everything first, proof has been found in a 4th century AD joke book featuring an ancestor of Monty Python's Dead Parrot sketch where a man returns a parrot to a shop, complaining it is dead. The 1,600-year-old work entitled "Philogelos: The Laugh Addict," one of the world's oldest joke books, features a joke in which a man complains that a slave he has just bought has died, its publisher said on Friday.