Petrol (fuel) stations. I just went to a petrol station during my lunch break and a number of the pumps were 'out' of diesel. It's just occurred to me that presumably for the pump to be 'out' of diesel it must have run out on someone at some point. Has it happened to you? Do you know anyone it's happened to? I certainly don't.
A mystery huh? Can anyone give me a better explanation than the one I thought of below?
My only explanation is that they must put the pump out of action notices on when it gets low rather than completely empty.