A hungry fox
up and saw some ripe black grapes
hanging
from a vine on a very tall tree.
He
and
trying to reach them.
Again and again he
but no matter how much he
he couldn't reach the grapes.
He was very
they were just too high for him.
Finally, in order to hide
his disappointment, he
he didn't really want the grapes.
He went
off and
himself by saying, "I'm sure they weren't
ripe anyway."
From this Aesop fable, we get the idiom: "That's just sour grapes."