Introducing the Zig Zag Card with an extra kicker that will leave them all guessing...

Effect: The magician puts a card into a case and pulls its upper part to one side, the lower part to the other side.

The card forms a zig-zag that can be shown from both sides. To finish, the magician pushes everything back to its original place, takes the card out of the case and it is seen to be whole again.