Borrow a coin from a spectator. Now let the spectator draw a picture on the coin or do it yourself with a marker. Take the coin and show it clearly, show your hands completely empty. Then you wave your hands over the coin and change the mark on the coin by just one touch in a blink of an eye (no exchange!). The coin can be immediately handed out to your spectators for thorough examination, and as an astonishing keepsake.

Easy to learn!
Very visual!
A guaranteed jaw dropper!