This is the story of Bhim (One of the Pandava) and Hanuman. Bhim and Hanuman are Brothers, since both are sons of Vayu (the god of wind). This anecdote is an episode form the Mahabharta in which Bhim meets his half brother Hanuman, who teaches him the value of humility and modesty. Bhim who feels that he is the strongest person in the world is humbled by Hanuman who turns himself into an old frail monkey just to teach Bhim a lesson.