Learn this and you'll certainly be viewed as a powerful card manipulator!

The magician shows the four Aces and keeps them aside. Three spectators remove any three cards from anywhere in the deck. The magician then places the four Aces into four separate parts of the deck. The selected cards are returned to the deck, being nowhere near the Aces. Nevertheless, magic happens! After several shuffles, the Aces are found to be in the center of the deck, each separated by a card - those cards turn out to be the spectators' selections! A real crowd pleaser!