A hungry fox saw some ripe black grapes hanging from a vine on a very tall tree. He jumped and jumped, trying to reach them. Again and again, he jumped, but no matter how much he tried, he could not reach them. They were too high for him. Finally, in order to hide his disappointment, he decided he did not really want the grapes. He went off and comforted himself by saying, "I am sure they were not ripe anyway." From this fable, we get the saying: "They are sour grapes".