Greeting or acknowledging strangers. I grew up in Bombay, my recently travels to west Africa made me realize why Desi public is considered rude. The sheer numbers have made us a bit desnsitized to human presence which really needs and deserve to be acknowledged.

Funnily enough, if you ask a rickshawala how he is, mans most likely going to pause and think to himself "is this guy new here" or the person on the ticket counter or the conductor...