DIWALI - North Vs South

Happy Diwali all !! I was discussing about Diwali with my Colleague yesterday ( He is a Punjabi) & found out that in the North, Diwali is Celebrated commomorating Ram's return to Ayodhya after the 14 Years of exile. Ask any south Indian & he will tell you Diwali is celebrated because Lord Krishna killed Narakasura . Strange that such a paradox exists within the same country !! Probably thatz the reason why India is a land of unity in Diversity ..