The performer displays three solid cubes – red, white, and blue. He drops them into a square tube, blue first, then white, and finally the red. He turns the tube upside down, but the cubes are still in the original order!
The audience suspects something fishy and a thumping sound from the tube suggests an extra cube is being used. After several more surprises the “extra” cube turns out to be an egg! And everything can be examined.