Answer:
I have two coins, one is marked George I and one is marked George IV. One is genuine but one is a forgery. Which is the forgery?
An archaeologist unearths a coin bearing the inscription "57BC". How does he instantly know that it's a forgery?
Three doctors said that Bill was their brother. Bill said he had no brothers. Who was lying?
What goes up and never comes down?
Is an older one-hundred dollar bill worth more than a newer one?
Do what he says and you'll be fine, don't and you lose the game.