Two paper bags are shown with a 2 foot red rope in one and a 2 foot white rope in the other.
You snape your fingers; the ropes change places. Snap them again; they jump back to where they started. The spectators think you have an extra piece of rope in each bag - they are correct!
You reach into the bags and bring out two, 24-inch red and white candy cane striped ropes, leaving the bags completely empty.