A video of a 15-year-old Karan Johar making his acting debut has gone viral on social media. The clip is from a 1989 TV show called 'Indradhanush' which also featured Urmila Matondkar. Twitter users shared the clip on the filmmaker's 50th birthday. Karan made his acting debut in Bollywood with Shah Rukh Khan's 'Dilwale Dulhania Le Jayenge' in 1995.