Like most kids his age, Auro doesn't want his friends to see his mum dropping him off at school. He's not very fond of girls, and most of his jokes involve the potty and what you place on it. In fact, he seems so obsessed with that particular body part he's nicknamed his grandma 'Bum', because she's got a big one.


Auro, of course, is the protagonist of director R Balki's Paa. He's your average mischievous 12-year-old, except for the fact that he has progeria, a rare medical condition that accelerates the ageing process. So although he's only stepping into his teens, Auro has the body of a 65-year-old.


In what can be best described as a casting masterstroke, Amitabh Bachchan steps into the (relatively) small shoes of Auro. Contrary to what the film's marketing conveys, Paa is actually a mother-son story. Vidya Balan plays single-mum Vidya, who raises Auro with some help from her mother, after dumping her selfish boyfriend in college, when he suggests an abortion. Amol (played by Abhishek Bachchan) is not ready for marriage; he is keen to follow his father into politics.