Two Lines and Vultures :

Two Lions with inflated EGO, reached the pool at the same time to drink water.
Both of them wanted to have water first.
A ferocious fight to the finish as to who will drink water first, broke out. Soon they were bloodied all over.
It is then they saw Vultures flying over them, looking down hungrily. Soon they realized their folly, stopped the fight and started Drinking water TOGETHER.