Vampire Escape

A vampire card is inserted into a case (representing a coffin) and secured with a fastener. The vampire card is unquestionably locked in place. The magician calls attention to the fact that the card can not be removed without removing the fastener.
Even so, at the performers command, the vampire visibly penetrates the case. It seems to magically melt through the fastener.
No sleight of hand required! The spectator can examine all the props before and after the trick.