The story behind this idea is even more exciting. As far as I remember, it was a pitch night, we were all tired, every idea we presented to our seniors bombed, personally I was going through a traumatic break-up, fiancially - I was peeking in and out of the UPI app to check my balance, EMIs were pending, and everything was a hogwasch. I booked a cab from my office, got into it, still feeling low. I was in no mood to know who my cab driver was, where he comes from, why is he over here...yada...yada...yada. 
But as luck would have it - This guy was a chatterbox. He kept on talking until he noticed my silence. He peeks in through his rear mirror, and asks "Is everything alright sir?". Now, here is a thing, one should never ask a person how f-ed up he is. And, I thought he got a whiff of the environment. But he said something that still echoes in my mind "Sir you can say anything you want, nothing goes beyond the four doors of the cab". And that's where my creative brain started to stir which led me to this idea of a.....

HAPPY CAB