Using a borrowed deck the spectator freely chooses a card, signs it, puts it back in the deck and mixes the deck. Then he places the deck inside his own pocket. This gives the magician any number from 1 to 52 to choose from.
The spectator's choice is absolutely free.
The magician now slides his hand into the spectator's pocket and withdraws the signed card that had been lost in the deck!Bonus:
A brand new version of "Knife Through Card" that can be performed with the same gimmick!
Needs no technique
You will need a standard Bicycle deck (not included)