A Tale 

Once up a time, there was a king who had an elephant and a donkey.  He used take both of them to wars. He used to ride on elephant and elephant used to muscle down the enemies. Donkey used to carry wounded and dead soldiers back to the post. Elephant and donkey were tamed under a same roof. And they used to argue about their importance in the war. One had the feeling of being better than another. This dispute was presented to the king and king decided to change the role of each other. Both of them were happy and went to the war other day but donkey couldn’t kill any enemies and elephant couldn’t run faster. They both got killed that day.