The magician displays a clear plastic sheet in a decorative frame. The audience can examine the frame. Two playing cards or visiting cards, which also can be examined, are now sandwiched in the frame with the clear glass in between.
The magician pushes a pencil through the middle of the frame, making two holes in the cards, but when the cards are removed, the clear glass sheet is found to be entirely intact. A very good close-up trick that can be handed out before and after the penetration.