A fox jumped into a flock of geese. The geese were frightened that the fox would eat them all. The fox, on the other hand, as a matter of generosity, granted them a last wish.
“Say your last wish,” said the fox.
“Please let us say our prayers before we die,” replied the geese.
“Go on,” said the fox and the first goose began to honk loudly. After it second goose started honking. Then the third, then the fourth and then another and so on.
And eventually their cackle made the fox sick. It got severe headache and went home without having its kill.

Moral : It costs to play generosity.