Place a penny on the back of someone's hand. The penny will disappear and a dime will take its place.
This trick is done by a spectator from the audience -- yet he doesn't know what happened! Or, you can do it yourself. Equipment can be thoroughly inspected. Can be done in the spectator's own hand! Lay a penny on his hand. Ask him to place the block on the penny. Remove the block and PRESTO!...it becomes a dime! Spectator actually has contact with the penny right up until the last moment--and he sure is surprised!