Crossed Cards trick
Prove that two objects can occupy the same space at the same time!
Effect: The magician removes two packs of cards which have somehow been pushed together. He removes the red-backed deck and a spectator freely chooses a card. Their selection is replaced in the pack and all of the cards are placed back into the red box.
The performer then opens the blue box and removes a blue-backed deck of cards! He spreads through the deck and finds one red-backed card-the spectator's selection!"
Comes complete with specially-made boxes, deck and complete, photo-illustrated instructions.