Here’s the trick. A Cards Against Humanity game box sits on a stool on stage. You ask a random audience member to name the most random thing they can imagine. They say something like “Ed Sheeran Blowing Bubbles.” That’s pretty random. Then they join you on stage, open the box and find one game card inside, it reads: “Ed Sheeran Blowing Bubbles.” That’s the trick, now let’s learn the secret…