IT DIDN'T WORK.
It isn't always safe for a small boy to take his father's jokes and games too seriously. This was shown very plainly at one time by the experience of an Englishman and his son upon a railway journey which they took together. While the little fellow was gazing out of the open window his father slipped the hat off the boy's head in such a way as to make his son believe that it had fallen out of the window. The boy was very much upset by his supposed loss, when his father consoled him by saying that he would "whistle it back." A little later he whistled, and the hat reappeared. Not long after the little lad seized upon his father's hat, and flinging it out of the window, shouted, "Now, papa, whistle your hat back again!"