When I was a young`n, I had a thing of taking everything apart. Remember trying to fix an old valved television, there was this thick dust on top of the valves, so with my idle fingers I proceeded to "dust the valves off". Which in turn "dusted" me across my bedroom. 
Was fiddling with a video that wasn`t working once, so I changed the fuse in the plug with another fuse that I didnt know worked or not. So to save taking the plug apart again I pushed it into the socket without the cover on it, using my hand to hold all the prongs in place. That was a serious duh moment
Got a good old belt off my electric cooker a few years ago...
that hurt
One night the bulb blew in my bathroom, so I took the bulb out and went to get another. Came back with a new one and whilst fumbling for the light fitting in the dark, I stuck my thumb into the business end of it. .
Had a good belt off playing with plug leads on an electronic ignition. Believe me, it`s got more of a "bat" than a points setup
Once changed the battery in a keyfob for an aftermarket car alarm. It was a little tiny battery that had the words 12v on the side. So me thinking "that`s not 12v" , decided to check by putting it on my tongue

Was fiddling with a video that wasn`t working once, so I changed the fuse in the plug with another fuse that I didnt know worked or not. So to save taking the plug apart again I pushed it into the socket without the cover on it, using my hand to hold all the prongs in place. That was a serious duh moment

Got a good old belt off my electric cooker a few years ago...
that hurt

One night the bulb blew in my bathroom, so I took the bulb out and went to get another. Came back with a new one and whilst fumbling for the light fitting in the dark, I stuck my thumb into the business end of it. .

Had a good belt off playing with plug leads on an electronic ignition. Believe me, it`s got more of a "bat" than a points setup

Once changed the battery in a keyfob for an aftermarket car alarm. It was a little tiny battery that had the words 12v on the side. So me thinking "that`s not 12v" , decided to check by putting it on my tongue



,
i grabbed her by the shoulders and said "right love, you go and watch telly, i'll tell you when i've finished!". she was stood looking round the living room door apologising until i left. not the first belt i've had and probably won't be the last