Ranbir Kapoor is one of the biggest stars outside of the Khanate ruled by the Aamir-Salman-Shahrukh triptych in Bollywood. But his last few movies have not set the cashbox ringing at the box office, the ultimate arbiter of an artiste’s worth over a weekend in a cut-throat film industry. The 35-year-old actor now returns with a biopic on Sanjay Dutt made by a filmmaker with the Midas touch, Rajkumar Hirani, who has never failed in the past 15 years. In a freewheeling interview with Giridhar Jha, barely a few days before the release of Sanju, Ranbir discusses, among other things, the most challenging role in his career and why he does not want to spoil the legacy of R.K. Films by reviving the iconic banner founded by his legendary grandfather Raj Kapoor. Excerpts from the interview: