While films are inspired by Hollywood movies, it is not easy to have our actors give performances inspired by their western counterparts. Especially the really memorable roles those are now synonymous with the actor playing the part. Well, our evergreen Rajinikanth it seems has been inspired by Heath Ledger’s Joker from ‘The Dark Knight’ which was part of the Batman series. For anyone who has watched Heath’s performance or for that matter, even Jack Nicholson essaying the role, they would know that it is not an easy role to play. But one can learn from the portrayal of that character for sure. A unit source revealed, "The Joker’s character in Batman had elements of madness in him. It was these unpredictable quirks and traits that made the character engrossing. Rajinikanth suggested that Robot should depict similar traits in the film as he felt that incorporating those traits would make the character a lot more interesting to watch."