Mumbai, Oct 4 (UNI) Writer Farhad Samji is currently developing the screenplay for the third "Munna Bhai" film, directed by Rajkumar Hirani. His involvement brings him back to a franchise he first became associated with while working on the original film, "Munna Bhai M.B.B.S.", released in 2003. Samji's connection with the film began even before its music took shape. He had written the opening refrain of the popular number 'M Bole Toh' following a late-night call from composer Anu Malik. Earlier in an interview, the writer recalled receiving a call around 10:00 PM. Malik asked him to prepare a mukhda…