When I was 4 yo, I was trying to unplug a humidifier from an extension cord, but couldn't get it out. And as every 4 yo knows, if you can't get a good grip with your hands, you use your teeth. Pulled it out just enough for my teeth to contact the prongs. 1980.

@reddywhp.bsky.social : Around the same age I found an open out let and thought it was a keyhole and stuck a key in it. Blacked out and there was soot all over the outlet and on my hands. Woot!