In the Savannah there are some lions.
They are very hungry.
One day, the lions see a giraffe and they think that it is food for them.
They want to attack all together but the leader of the group is so sure of his talent that he decides to attack alone.
But the giraffe is clever and it is able to run away.
The moral of the story is that you must not be vain but you must accept other people's help.