Ten face down cards are introduced, five have red backs, five have blue backs. A spectator chooses a set for themselves and the magician keeps the others. Both magician and spectator shuffle/mix their cards. Then the magician and spectator selects a card from their packet and then swaps their selection with each other. When the selected cards are turned face up, both cards match exactly. Despite the fairness of the shuffling and the selection, both magician and spectator have managed to choose the same card. But wait, what about the remaining cards? When the rest of the cards are turned over they are seen to be all JOKERS!