My late MIL was staying over Christmas, when I got up on 25th for the Annual Turkey Wrestling contest, the fridge light was off, Oh the bulb's gone, I naively thought. Then realised it wasn't at all cold and noticed that the power was off. MIL's reasoning, she didn't like to leave things switched on overnight, she would never have a fridge herself. Luckily it was just a fridge with a freezer compartment, chocolate ice-cream for breakfast was a special treat.
This was the same MIL who stayed with us for a few months during which OH lost a set of keys from work, for which he would have to pay £500 if not found. When she had packed to go home, we were checking round her room and for some reason I pulled a chest of drawers out, and there were the keys, on the floor. Oh I brought them upstairs for safe keeping!