You get out of a case a deck of cards contains 4 Aces and 4 Jacks. The four Jacks are placed face down on the table near the spectator and the magician keeps the four Aces in hand. The magician then takes one of the Aces and exchange against one of the Jacks of the package on the table. So there are three Jacks and 1 Ace on the table and three Aces and 1 Jack in the hand of the magician. After a magical gesture, the three Aces will turn one by one into Jacks. And spectators will discover that the Jacks remained on tables have turned into Aces.