You borrow a coin. Ask a spectator to sign it or to remember the date on the coin.
You take it and you make it disappear.
Then you take a small box from your poocket and you give it to someone.
The person open the box and find an other box inside.
So he open the second box, and find...a third box.......and a fourth. The spectator open the last box and find the marked coin inside !!!A totally awesome trick very easy to do.