We worked for three months in Mumbai. Then Raju stayed with me in the US for 35-40 days. We had a rule. Raju and I would go out on a walk and not come back until we had a scene. The rule was that the scene should make us laugh or cry or should contain some really provocative thought. If it was not doing one of these things, the scene could not be part of the film.
Once while walking at Bandra (a Mumbai suburb), it starting raining heavily. But because of our rule -- that we cannot return untill we had a scene -- we just kept walking and did not return till we had the scene.
-Abhijat Joshi, co-writer of Lage Raho Munna Bhai and 3 Idiots, on how they wrote these movies. Its great to learn their paramaters, and the process!