India's biggest hit(Unadjusted to inflation) Om Shanti Om fully deserves that title. Aur kyoon? Batatahoon.
This looks like a film inspired from Karz, and is almost exactly like it. But SRK in the lead role, Farah Khan's direction and Vishal-Shekhar's music give a very different view to it.
This is a film which revolves mainly around 3 people. SRK(Om), Deepika Padukone[Shanti(Sandy)]and Shreyas Talpade(Pappu Master). Om Prakash Makhija is a Junior Artiste in some movies but wants to become an actor. Deepika is a succesful actress and Talpade is Omi's best friend. Arjun Rampal plays the villain, a producer by the name of Mukesh Mehra. Mukesh kills Shanti, Om dies helping her and is reborn as Om Kapoor or OK who is a great actor in India and Sandy wants to work with him and so on. Overall, the performances are first-class and the direction and dialogues are remarkable. A full thumbsup for OSO!