Amitabh Bachchan revealed a interesting secret. Superstar Rajnikant told Amitabh Bachchan not to do the role of villain in Robot -2. This film came in 2010. This film was directed by S. Shankar. Aishwarya Rai Bachchan and Rajnikant played the leas role in the film. Big B said, 'Shankar came to me. He wanted me to play the role of villain in Robot-2. I called Rajnikant. He has people wont accept you an villain. You don't do this. I said okay.' Amitabh told all this during the promotion of his film 'Wazir'. When asked from Amitabh Bachchan, will he be the part of Dhoom 4, on this Big B said, 'this I have heard for the first time.'