i sort of pulled one of these yesterday
http://www.youtube.com/watch?v=0VxK4jzKg5si think it was because i was stoned. i didnt jump back though. i knew it might happen because the ground was wrapped around the feeder and i didnt want to go outside and pull the bubble to kill the power. when i went to snake a ground wire out of the rats nest, kaboom. well, it was more like 20 kabooms, because it wedged itself in there. i just stood there waiting for it to stop. black shit all over my face.
so next time youre about to do panel work, dont text and drive.