Treat yourself

Use the coin wallet for your coin routines

The magician (that's you) then reaches into their pocket and retrieves a state of the art Lie Detector machine

Answer: The trick can be used many times (if you find it on the floor)

Terry Herbert Children's Magic - (DVD) D’Angelo Treat yourselfTerry Herbert: Children's Magic the Herbert Way Performing children's magic isn't kid's stuff! Doing a magic show for kids isn't easy! However, in the right hands, it's a highly rewarding and lucrative market with a bottomless client base that can potentially keep your booking calendar filled all year round. The problem comes when you wish to set yourself apart from others in your market who are all doing the same tricks with the same canned pattern.