I used to leave one fully charged on the work bench. Some clown would always pick up things off the bench to check it out. Only picked it up once. Not so subtle hint to keep your hands to yourself and not touch my stuff.....................
Back in the late 70's we had a photographic flash unit that had a 6 pack of caps larger than beer cans. We had a Huge 100 ohm resistor used to discharge it before working on it. My screw driver slipped and the thunder and lightning that happened was deafening and blinding. Luckily (or unlucky) I was looking the other way, but I still see spots! The screwdriver welded itself to the wiring connecting them! LOL
Well... we better stop derailing this thread....I will maybe open a thread in the off topic for automotive themed tricks we played on unsuspecting friend when we were young....