The magician holds a packet of 16 cards with a joker on top. When the joker is lifted the audience can see a star shaped hole in the corner of all remaining cards. The joker is waved below the deck and can be seen through the hole. The magician then places the joker back on top of the deck. With simply a few magic words, the joker is removed, the cards are restored and all holes are gone!
The audience can even examine the packet!