A spectator selects any card and initials its face at both ends. The signed card is placed halfway into a regular card box. The magician writes their initials on the box, and in an instant those initials visibly jump from the box onto the spectator's signed card!
The signed card and the box can immediately be handed out for examination. No card switch, palming, or stealing is required. The effect resets in just two seconds and can be repeated with a different card.
