Present a brass tube and four metal rods of different colours. Turn around (yes, do a full 360—no peeking!) and let your spectator choose a coloured rod to pop inside the sealed brass tube. Now, tell them to stash the remaining rods in their pocket so you can’t see them. When you turn back, you’ll know exactly which colour rod they’ve chosen! Is it mind-reading? Is it sheer genius? You’ll just have to keep them guessing!
