You get zapped when you assemble the thing or if you don't properly insulate the connections. A well done finished product will never zap anyone. And even if you get zapped, the current is so low, there is no danger. Maybe it would be a good ideea to let your boys see what it feels like, so they learn the proper respect for electricity and never stick a nail in a wall outlet. I've been considering doing it to my 5 year old, but it just seems so cruel. Still thinking about it - it is a powerful lesson after all, and harmless.

Born of Sith, seduced by the light side.