A picture may be worth a thousand words and, in the case of Arshad Khan, a lot of money, too. Khan, an ethnic Pashtun who works as a tea vendor — popularly known as a “chai wala” — became Pakistan’s hottest celebrity in 2016 when a photographer, Javeria Ali, took a shot of him for Instagram as he worked at his tea-stall. The image was shared tens of thousands of ...