When I was 3, I took aprt my grandmothers new toaster, and phone. My dad came in and saw the parts all over the floor. He went ballistic, ranting about how i would never be able to put them both back together again, because the parts were all jumbled together. He left and went to buy my grandmother a new toaster, while my mother used the other phone to call Southern Bell to come out and fix the phone.
By the time my dad got home with a new toaster, I had them both back together and working. That is when they decided that I needed an erector set, lego, lincoln logs, tinker toys. I then began taking other things apart. Mom's washing machine, dad's lawnmower, my brothers stereo. I built my own GI Joe Training center, complete with helipad, escape slide, etc.
I did not mess with electricity too much. but when I did, sparks and a blown fuse were usually the result.