Mental Card Transposition

The magician shows two small packets of cards, one with red backs and the other with blue backs. Two spectators mentally select a card. The magician then spreads the two packets showing that in each one there is  only one face up card and the two cards are exactly the ones thought of by the spectators! Surprisingly the two cards have a different colored back than the others in their packet but that’s not all, because when all the other cards are turned face up… they are seen to be all completely blank for a devastating climax!   • Bicycle cards  • A memorable climax • Completely automatic • The two cards are only thought of