Magic Stop Light Cards

Two black cards are shown, each in its own clear plastic sleeve. One card is all black, and the other card is black with a red spot, a yellow spot, and a green spot on it, just like a traffic light. A colored spot is freely selected by a spectator. Both cards are removed from the clear plastic sleeves and one card is placed in each of the spectator’s hands. A command is given and the selected spot vanishes from one card and appears on the other while in the spectator’s hands.