"HE CAN DO LITTLE WHO CAN'T DO THIS."
One of the players takes a stick in his left hand and thumps the floor with it, saying, "He can do little who can't do this." Then he hands the stick to another player, who will most probably use his right hand when holding the stick and thumping the ground. If he does he is told he has failed in the simple task, and the stick is handed to another. The game goes on until someone discovers that the secret of the trick is to copy the leader exactly, and therefore the stick must be held in the left hand.