The Sour Grapes

Once a hungry fox was passing by a vineyard. He noticed a juicy bunch of grapes on a grapevine.

He jumped. But he could not get them. Again, he jumped to reach them, but as much hard he tried, he could not reach the grapes.
Tired of trying again and again, he said to comfort himself, "The grapes look sour. And who would like to have sour grapes."

Moral:- People generally hate what they can't get.