Two sets of five ESP cards are freely shown. One set is placed into an envelope. A spectator selects one of the ESP symbols from the remaining set, let’s say, they choose ‘the circle’ The magician takes a razor blade and drops it into the envelope along with the first set of ESP cards, the envelope is handed to a spectator and they are asked to give it a shake. The envelope is retrieved and the contents tipped onto the table. The five ESP cards fall out along with the razor blade; however, one of the cards has been sliced completely in two! The selected symbol!
Can be repeated with a different outcome!