Magic Crystal Coin Case
You show two pieces of plastic and a section a coin can fit into. Any coin up to the size of a £2 can be placed in between the two sheets of plastic, then the coin is locked in side with elastic bands around the edges of the plastic. You now proceed to place the locked coin under a silk, and let the spectator it.
With a magical gesture the spectator is requested to remove the silk, and the coin has COMPLETELY VANISHED!
Watch the video demo: