Here’s what happens:
With no gimmicks, the magician gently massages the loops of a spectator’s shoelaces and they visually link together. The laces must be untied to come apart. The spectator’s shoes are re-tied and the laces link again, this time in their hands. You can then leave the spectator with their shoelaces linked together ending completely clean. This stunning effect allows you to create an impossible object with something that belongs to the spectator. It’s that strong and that easy to do.