There are some things that make total sense. Unfortunately, this is not one of them. In fact, anyone who sees it will surely lose sleep trying to figure it out. You ask to borrow a spectator’s finger-ring. You then display a rather large brass bolt and a nut threaded onto it. The nut is twisted off and the ring goes onto the bolt. The nut is threaded back on and you show there is no possible way to remove the ring without unthreading the nut first. A cloth is placed over everything and you immediately reach underneath the cloth and remove the ring and hand it back to the owner. When the cloth is pulled away, you reveal the nut still threaded onto the bolt!