Out Of The Fifth Dimension by Ed Mellon and House of Enchantment (M10)

Two cards are shown on both sides. Each of the four sides is numbered using the numbers one to four. The performer explains that Einstein tried his entire life to prove the existence of a fourth dimension but you will go one step further and prove the existence of the fifth dimension!!! With that the performer separates the cards and a giant number 5 appears on one of the cards. Alternate ending: Instead of the number 5 appearing the words six of clubs appear. If you can force a card you have two tricks in one.