The rise and fall of whistling

There was, at least until recently, an old sign round the back of the Savoy banning whistling by staff or tradesmen. Whistling, it seems, can wind up some people. Winston Churchill hated the practice. Posters were put up in the War Rooms forbidding it. One day, on his way to Downing Street, he heard a paperboy whistling and sharply told him to stop it at once.