Got zapped by my Engine !

We had an old Murrey tiller that had no shut off switch, either you had to ground the tip of the spark plug out with a screwdriver or pull the choke.
If you pulled the choke it was a PIA to re-start.
One day I mis-placed the screwdriver, and decided to use my pocket knife, well the rivets running thru the handle of the pocket knife, will shock the hell out of you, I think my hand tingled for an hr afterwards.

I still have the old Murrey tiller (cirtica 1965) it still runs good, but I did wire a shut off switch on it.