The Lion and the Mouse
A Lion was woken by a Mouse running across his face. He caught the Mouse and was about to kill it.
“Please let me go,” begged the Mouse. “I might help you someday.”
The Lion laughed and released him.
Later, the Lion was trapped in a net. The Mouse heard his roars and came. He chewed through the ropes and set the Lion free.
Moral: Even the smallest friend can be a big help.