 The actors used several techniques to develop their characters . Arshad Warsi ( " Circuit " ) encountered some initial problems reviving his character from the first film . On the first day of the shoot when Arshad , " said his first line , he didn 't sound like Circuit at all . He sounded like Arshad Warsi speaking with an accent . " Warsi admits that he had " forgotten " the character of Circuit and had to watch the DVD of Munna Bhai M.B.B.S. three times before being able to film the scene correctly . Sanjay Dutt ( " Munna Bhai " ) also confessed that he had to watch the first film eight to nine times to recapture the " persona " of Munna Bhai . In addition , Dutt stated in an interview that he did not read Gandhi 's autobiography My Experiments with Truth as a preparation for Lage Raho Munna Bhai . Rather , he comments , his father , Sunil Dutt ( who portrays Munna Bhai 's father in the first film , Munna Bhai M.B.B.S. ) and his mother ( the late actress Nargis ) were his role models as they " were basically <unk> . We were brought up with those values . " 
