My Dad would always ask "Who's been playing with the thermostat ?", by far the most inane question ever know to man. Then he would get pissed when I'd say that I love to disassemble it and the reassemble it blindfolded.

Who plays with a thermostat ?

Now I come home, look at the thermostat, look at the kids, and I know, I just know that they've done something to it, I just can't bring myself to ask.