I keep this ball and vase trick around because kids like it.
Sure, you are brilliant. We get that know how it works. You can also read this post. While little kids often find card and coins tricks to be a yawn, they love even a lamely presented magic ball and vase!
After you fool them with the trick a few times, sneak the ball insert out and let the kids play with the empty vase.
It is as much fun as fooling your cat with a laser pointer.
Magic Ball and Vase via Amazon