One time eons ago, at least a good 15 years, I recall being really bored because the only computer in the household was occupied by my brother playing Doom and I wasn't old enough to play that game, at least; and I was still a rather goody 2-shoes type as well, so I was bought into the belief of it being a sort of "devil game"; stupid in it 's own right, but not the main one in discussion. Well, I have this lamp (still the same one in my room today), and it has the kind of pull strings with metal ball bearings weighing down the cords that trigger the lightbulbs.
Here's where the lightbulb comes off for me; I come up with the *bright* idea to pick up one of those ball bearings, and since there wasn't a lightbulb in one of the sockets, I decided to put the bearing inside. I don't know what I was thinking looking back, but not only did I get a satisfying amount of volts plunging through my body (and retaining enough composure to play cool and not reveal I was responsible), but I also shorted out the household power grid (probably toggling all of the breakers).
More recently, my mom has some Christmas lights setup outside, and the main circuit box it's plugged into seems a tad shady enough on it's own. In an attempt to unplug the main extension cord (it was getting late, and I didn't notice the surge protector with a light switch on it at the time either), I have my fingers on the circuit box (nearly on top of the outlets) and the end of the plug; oh yeah, and there was dew outside, and I wasn't wearing shoes either. Once I pulled the cord out, I felt a familiar pulse course through my body. Unlike some people that get stuck to surfaces and such when being shocked, I was able to quickly disconnect. I ay have built up a resistance. Sure got me amped though after it happened.
And one of my favorite stupid acts: hairline fracture on my left wrist. Cause of fracture: falling backwards while running backwards. To explain why I was doing so, every once in awhile, the beach sand had a good dose of phosphorus, and when you walk on the sand, it glows like a combination of fireflies and those glow-in-the-dark stickers and such. Because it left a neat trail, we wanted to see the trails we left behind, so we were running/shuffling our feet across the sand backwards really quickly. Unfortunately, the same sand that carries these glowy particles is also really fine grain, and really damn hard after it gets wet enough, and is the right water:sand ratio; now fall backwards at running speed into that, and try to catch your fall. First broken bone I got.
Proof of certified stupidity: I was not under the influence of any drug nor alcoholic beverage when I did any of these. ...Yeah.