The audience takes one card and signs it, then puts it back into the middle of the stack of cards. Then he lets the audience look at the top. Then insert a deck of cards into the card box and asks the audience to push the card that is still visible into the deck until it is completely invisible. then the magician drops the card box and finally only one card is visible and it was a spectator's card with his signature.
- no reset
- no sleight of hand
- no thread