Two half dollars with single holes are shown to the audience. A spectator is asked to select a coin. A “Holey Half” is placed into the spectator’s hand. The magician keeps the other half and it “morphs” into a solid half. When the spectator opens his hand his half now has two holes.
The Magician says, “Holy Cow!” as he places the solid half in the spectator’s hand. The spectator is asked to examine the half and sure enough, it has a sticker on the reverse side of a Holey Cow.