Sophomore year in high school... I had kicked the wall mounted switch to the "off" position outside the classroom I was waiting to enter. When the teacher arrived, I reached over to turn the switch back on... not realizing that the spring for the switch was poking out through a crack, and energized. Got a small scar the diameter of the spring on my finger as a result.

A few while working on bikes and cars... usually faulty insulation on spark plug wires discovered the hard way.

My only "professional" tingle was while re-routing conductors into new paralleled 3/4" EMT for a picky AHJ who flagged an inspection (even though we were under the number of wires allowed by Code, he wanted fewer wires in the pipe). [Linked Image]

My foreman in one room by the panel, me on a ladder in an adjoining room at the 1900. Moving certain wires from one 3/4 to the newly installed 3/4)

Me: "Did you kill that blue circuit?"

Him: "Yeah, it's dead... go ahead"

Me (after cutting wire, pulling it out, running new to the panel, and stripping the end - reach to splice and finding out IT'S HOTTTT) [Linked Image] "Yow! Hey, ya moron, I thought you said the line was dead!" [Linked Image]

Him: "Oops... wrong blue. <CLICK> Sorry, Dude!!!"

I NCV'd it anyway, and made the splice.

I figured if my journeyman foreman (and friend) with many years experience could screw up (luckily without drastic results), that was enough to have me double-check everything since.