Director R Balki shared that he was on the verge of calling off his film 'Paa' as Amitabh Bachchan looked "ugly and scary" during the look tests. "Because he's 6'2 and he is big, and I had not thought he is a child. Which child is 6'2?" Balki said. Bachchan played the role of Auro, a 12-year-old boy with progeria.