Electric kettles used to be very bad for that.
We were given a Molinex one in the late 1980s that used to leave a little spot of water on the work surface. They were quite common in the day but absolutely no photos on the web now. There were no digital cameras and RCCDs were still rare.
I was woken in the middle of the night and then heard a loud bang. I resigned myself to having to repair something in the morning and just as I was going back to sleep again there was another bang. I got up on the grounds that something had to be done about it as it had not crowbarred the fuse out.
I could smell it in the kitchen so that was the room that got all the plugs pulled.
It was the next evening when I started with the kettle as a suspect and found that the window had a little drain hole at the bottom indicating that it was a problem known to the manufacturer.
When shopping for a new one in one of the big appliance sheds that still trades to this day I spotted a cordless one in the same style including the little drain hole
