"Would you mind letting me off work fifteen minutes earlier, sir?"
asked the bookkeeper. "You see, I've moved into the suburbs and I can't catch my train unless I leave at a quarter before five o'clock."
"I suppose I'll have to," grumbled the boss; "but why did you move? Didn't you think of travelling to work?"
"I did," said the bookkeeper a little later, "and that's the reason why I moved."