Actor Arshad Warsi shared that a lot of his jokes in the 2003 film 'Munna Bhai MBBS' were improvised by him. "Most of the things I did were improvised. It was all extempore," he said. Warsi added that looking at his surroundings, he'd come up with small bits and share them with director Rajkumar Hirani, who would think about them.