Great idea. my sister had one as a kid and in hindsight if I'd have been my parents they'd have driven me mad!Get him a Bop-It they do my head in so should work
Casio keyboard.
I was going to say keyboard.
Lots of batteries to go with it as well
Multi colour pack of sharpies
better idea, buy one pack of sharpies and design a new box making them out to be washable face paints
As a parent that has experience, it takes days to come off a child
Sign the kid up to the GD forum...!!