Cool idea, I would just work on ways to make it more impossible and deceptive. It isnt the most fooling, but if you tweak it and play with it more, im sure you can find a way to make it better. (Ex: maybe you could find a way to open your fingers; maybe you could make it go a little farther from your hand or bend it in a way someone else cant.) Just some ideas to consider, good luck with it! -Kyle