The magicians Penn & Teller have this card trick. Except it’s not really a card trick, it’s an iPhone app. You tell a friend that you know Penn & Teller and that they can guess cards remotely. To prove it you ask them to name a card, then you pull out your iPhone and tell your friend to send an SMS message to Penn (or sometimes it’s Teller). They always respond, because you are such good… → Read More