Penn & TellerThere are some basic rules of magic. Never tell your audience how a trick is done, don't show the audience how you prep for a trick, and never, ever perform the classic cups and balls trick with transparent cups. Well, Penn and Teller manage to break all of these rules and more in their show at the Rio Hotel and Casino and its perfection. Just like every amazing duo, Penn and Teller have their strengths and weaknesses and combined, they create the