The Movie Illusion: A card is shown, turned away from the audience (in this case Ralph Macchio's Bill) and when turned back again, it is a completely different card.
Performed By: Bill's cousin Vinny (Joe Pesci)
How Did They Do That? Most likely explanation is that Pesci has two cards in his hand to begin with and ditches the first one when his hand drops just below the table for a split second. It helps that Pesci is generally a distracting a person anyway.