Magician shows five cards fanned out.
The two to the left are indifferent cards and the two to the right are indifferent cards, but the center card is a Queen. The fan of cards is turned face down and the spectator is asked to attach a paper clip to the card thought to be the Queen. Every time and everyone who attempts to clip the Queen is wrong when the fanned cards are turned face up!
Very easy to do. Recommended for young performers of magic.