Searching for food to satisfy his hunger, a Fox suddenly saw a vine full of big grapes and ran towards it greeedishly. But unfortunately, the grapes were so high that it was impossible for him to reach them. He tried again and again, but couldn’t even touch them. Bitter and frustrated, he comforted himself by saying: "Anyway they don’t seem ripe, so the taste must be very bad. Surely they are sour”.