How can you tell its a Desi ?

Question : You are driving on the highway. In the lane next to you is a car with 4 people, all of them smiling at you. You are trying to figure out their nationality. How can you tell if they are all Desis?

Answer : Quiet simple actually. Wait until the car is looking to change lanes - if that was a Desi car, you will see all the 4 heads turn to look behind for other cars in the blind spot , if just the driver looked behind, then definitely not a Desi car...