On a recent Jet 2 flight from Leeds Bradford airport to Malaga the stewardess nervously announced that there had been a mistake with the catering.
There were 200 passengers but only 100 hot dinners, so if anyone would care to give up their dinner to a fellow traveller, Jet 2 would give them free drinks for the rest of the flight.
An hour and a half later the stewardess announced "If anyone is interested, we still have 100 hot dinners left...?"