So you must be from India

I look Indian enough, and sound Indian enough that I expect people to guess quite accurately where I am from. Now recently I was out with an Indian friend of mine meeting some people I knew. As we were introduced to someone neither of us knew, the guy in question guesses quite rightly that I am from India, but he is thrown off a little and guesses that my friend was raised here. My curiosity got the better of me and I asked him how he had come to that conclusion. He replied that it was the accent. rowing up in Bombay I was exposed to a whole variety of accented english(and hindi for that matter). There was the telgu,tamil,malyalam , north indian , marathi and gujrati versions, each distinct from the rest(all of which I can proudly imitate). Naturally it never dawned on me that I too had an accent. But why then did'nt I develop an imitation of the american accent after living in the states for 5years(trust me there are benefits to be had)?
Well quite simply it was this converstaion I overheard at Hyderabad airport between an Indian settled in the US with his born and raised in US daughters. That grotesque blend of the texan drawl with the telgu pechnant for appending "OOO" at the end of every word was all I needed to convince me that there was no way in the world I was speaking like that.