I've had three, all as a boy, but only one, I think, was absolutely my fault. So far, touch rubber-coated wood, none as an adult.
The first was when I was about six and was given a 3V Airfix motor. I didn't have any batteries and thought "well, I'll just wrap the wires to the plug and, hey, it'll go faster than normal but what else could happen?
".
I suspect that I assumed that the big pin was important and so wrapped one wire round that. I also guess that my 50/50 option on the other two I must have picked the live. So, big flash, much blackness around the wallsocket and my palm, which meant I couldn't deny it to my dad.
The next was when I was a few years older and was knelt down plugging something in that did not have sheathed pins. Must have had my finger brushing the live pin when I was thrown across the room and landed on my back. Tingling hand and bl**dy sore back for a few days.
The final one was at me old Grandad's. My dad told me to plug in the mower which, I think, had a relatively modern (30 years ago!) plastic plug, sheathed pins, the lot. But, when I plugged it in I got a distinct tingle in my fingers (similar to when I take my laptop into the bath
). I complained to my dad and he said "don't be stupid - it's a plastic plug with sheathed pins - it's
impossible to get a shock off it!".
So I tried again and got the same result. To my dad's consternation, I got a screwdriver and opened the plug up and discovered that the multi-strand live connection had a wayward strand that had been trapped in the plug case and just had the tip protruding from the side of the case...