I still remember waking up in the middle of the night as a kid, where I tried to turn my reading lamp on and nothing happened. That wasn't special, the bulb had a habit of unscrewing itself from the socket so I often had to reach up and tighten it to get some light. So after sleepily flicking the swithch I blindly reached into the lamp to tighten the bulb I thought had come loose, forgetting that I'd removed the bulb the previous day because it had died. 220 volts through the fingers, baby! Took a while before I fell asleep again, I can tell you that much.