Originally Posted by fastflyer
It used to be commonplace in Europe, especially France, to find placards chastising hotel guests to use hot water minimally. Tiny, in-room hot water heaters had the effect of enforcing this rule.
Also used to be commonplace, at least in the UK, to need your keycard to turn on the lights and air conditioning. Might still be, I don't have any direct experience since 2001.