You want stupid? Try this one for size.
When we moved in to our current house, I had to install the washing machine in a utility area at the end of the garage. The plumbing and power was already there, but the space in the unit was very tight, and I had to cut the plug off the washing machine in order to feed the cable through a very tight gap. No problem - new plug fitted, all good.
Several years later, that washing machine died a death and we bought a new one. I carefully pulled the old machine out of its space and disconnected the hoses. Then I remembered that the plug wouldn't fit through the little hole in the side of the unit, and would need to be removed. Why bother? just cut the cable - the machine's going for recycling anyway.
I grabbed a pair of kitchen scissors and cut the cable. There was a huge blue flash, a loud crack and a puff of smoke. The scissor blades had a chunk melted out of them (about the size of a penny). I had forgotten to remove the plug from the socket - shit, I hadn't even flicked the power off.
I was completely unscathed. To this day, I don't know if it was the shoes I was wearing or the material the scissor handles were made from, but whatever it was, the current found a route that bypassed me.
Very fortunate - the state of the scissor blades made me shudder when I considered what might have become of me.
Believe it or not, I am Professor Cautious when it comes to this kind of thing, so I have absolutely no idea what I was smoking at the time.
Edit: and no, there was no wine involved.