You display a number of face down cards and have a spectator select one, and may change their mind as often as they like. The card is removed and place onto the table. You then explain, "I'm glad you took that card because these are all mine!". With that cards are all turned over and they all have MINE in big bold letters. "But the card you took is YOURS!" The spectators card is turned over to reveal the word "YOURS" printed on it in big bright red letters.
NO special counts or sleight of hand, NO rough and smooth, NO force instant reset