Dostana is a 2008 Indian Hindi-language romantic comedy film written and directed by Tarun Mansukhani, and produced by Hiroo Yash Johar and Karan Johar under the Dharma Productions banner. From Wikipedia
Drawing on Khan’s 99% people-management lesson from Dostana, Mansukhani readies his Rs225 crore comedy for a June 6 release featuring India’s first dual-ending format.
