Almost the same. I was checking for loose connections on an MSD 404 in a Hemi Super Stocker when the helper thought he should help and turned on the ignition switch. I straightened right up hitting my head hard on the hood. I fell to the floor twisting my knee, skinning my elbow, and hitting my head again on the concrete. The helpful assistant jumped out and ran around thinking he might have killed me. I was ok but I couldn't stand up for a while and my arm shook for at least 15 minutes. Capacitors can be very dangerous. I remember reading that those race Msd boxes could through a spark 7 inches through the air. I'm a believer.