Paa is one unusual film where, Big B showcases his versatility as an actor. This movie can be considered as one of the greatest performance by Amitabh Bachchan. He plays a 12year old Auro who is suffering from Progeria. The unique equation where he plays the son of his real life son is one that makes this movie different from others. The makeup and the voice modulation makes Big B look as an authentic 12-year old child.