how many soemtimes smile at strangers... whn r u r going for a walk... or jus goin ina train... whn u catch sometime lookin' at u...dont u smile at them in a sort of polite way... i wonder why we do it...!!!
a smile is a free thing to do and you never know, the smile that you give to someone, might be the only one they see during that day...so why not smile? what have you got to loose?