One of the best examples would be Satya(1997). This movie hardly had any kind of promotion or curiosity value initially. There were no stars, just ugly looking bearded men and a woman draped in a nine yard saree, called Urmila Matondkar. But when the movie released on screen, it turned out to be the most definitive movie of the underworld ever.
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it can be maine pyar kiya both Salman and the heroine are new to the movie field and without star power it become very hit and in old movie, when Bejju Bawra was made, Meena Kumari and Bharat Bhushan were not stars and due to the story line and excellent music by Naushadji, the movie become super duper hit and the same way to Jai Santoshi Maa, when it was made during eighties, no famous heorine was there in that movie, than only it become super hit due to its Mythological effect and pradeep songs. hence, we can predict, if a movie wants to become a hit, a good story line and sound music is to be there than only it can be hit. When Amitabh came to the scene, he is not famoust as that of today. Zanzeer made him famous and he become an Angry young man and hence all i can say is that good story with a sound effect is needed to make a movie a hit