You show one 10 $ and one 5 $ note. Now you place one on top of the other in your left hand. Close your hand and obviously remove the 5 $. Ask the audience what is left in your left hand. They will say the 10 $ note. But when you open the hand it is the 5 $ note and the 10 $ is in your right hand. Do it again, but this time use the spectators hand. Now, that is baffling! Comes with playmoney, but any money can be used. Is easy to do.