REQUIRED. a double-faced card, say AH-KD. Put this on the bottom of a regular pack showing the AH face, next to it place the unprepared KD and in the middle of the pack, reversed, put the AH. Begin by taking off the two bottom cards, showing their faces and drop them into the hat. Remove the double-faced card as the KD and vanish by means of a card box, by melting it in a glass of water, or any other way you fancy. Then show that the KD has returned to the hat while the AH has left it and is now reversed in the pack.