A friend who is working in Provence has rented a very nice, brand new flat. She noticed that the bathroom was always toasty warm, especially surprising because there's no perceptible means of heating the room. She remarked on it to a neighbour.
"Yes, but have you tried putting your hand in the toilet bowl?"
Our heroine had not, but she did forthwith. Hot water! The lavatory cistern is plumbed into the hot water system.
"Oh yes, it's a mistake, obviously, but it's quite nice all the same, isn't it!" was the owner's reply. "I have a list of lots of faults to correct, and that one's quite a long way down the list."