Sawing Through The Arm With A Playing Card

We often see on television, a modern magician attempting to deform himself in all manner of ways - some quite gruesome to watch. Here is a watered down attempt to shock and dismay. Taking a playing card from the pack, the magician presents his bare arm and proceeds to saw into his arm with the card. The card appears to become embedded in the arm, but of course we all know that it must be an illusion. The puzzling part of this demonstration is the fact that the card is withdrawn from the arm, and is shown to be regular. It's perhaps not as curious as a chainsaw through the abdomen, but much more appropriate for a younger audience.