Effect:
The performer claims he is able to find a selected and signed card
with the aid of a fuse and a small amount of plastic explosive.
After the fog has cleared, the card found by the performer turns
out to be the Joker.
The spectator's signed card has, however, traveled inside the matchbox he has been holding all the time. The spectator is allowed to open the box, unfold the card inside, and confirm his signature.
