card is signed by both a spectator and the magician, and is held to the magician's
tie with two clips. The magician discovers he has made a mistake, his signature
is upside down. This mistake is magically corrected by removing the central
part of the card (creating a very visual zig-zag effect) and putting it again
in its place after rotating it 180 degrees. In this way the card is restored
with the three signatures in the same direction. The card can be given for examination!
It is a very original effect, suitable for stand up conditions