warm day a thirsty fox found some bunches of grapes growing high up on a vine. "I must have those grapes," he thought.

Again and again he sprang into the air but he could not reach them. At last he went away, saying, "The grapes are very sour! Even the birds would not peck at them."

That is what people sometimes do when they cannot get what they want: they make believe that what they want is good for nothing.