Add this one to the list: Pinched fingers and jolted by an unplugged power supply.
I was just trying (and struggling) to put back together a 27in iMac after a hard drive swap, I'll spare you the details, but at the moment that I had to pull the LCD out again (ain't an easy feat on a 27in!), my fingers got pinched between the frame and the LCD.
All of that because like a dumdum I forgot to plug the LVDS cable (that I had mangled in the process of putting it back in), but that's not the fun part.
The fun part? Trying to reach for the cable, I suddenly felt like someone was repetitively stabbing my finger with a gazillion of tiny needles, yes folks, I accidentally touched the legs of the PSU's primary side capacitors.
Thankfully, these nasty little fuckers just had enough juice to give me a small tingle, and even more thankfully it wasn't plugged in (or I guess I wouldn't be there to tell on the tale).
Nevertheless, that day I had ordered a new LVDS cable to replace the one I had damaged, that new cable arrived two days after I gave the iMac back (LOL), just to add further insult to injury.
Proud owner of a Shuttle HOT-555A 430VX motherboard and two wonderful retro laptops, namely a Compaq Armada 1700 [nonfunctional] and a HP Omnibook XE3-GC [fully working :p]