Well, when I ride home in the mornings, I do not see much smiling people in any of them cages. Quite the opposite, cranky looking bastids most of them!
I am willing to bet a dollar that this rumor was started by someone driving a car, drinking a mocha latte special non-caffeine morning "coffee", texting on the phone, playing with the radio/gps/iThing, putting on lipstick and screaming at the kids on the back of the SUV and still having time to wonder why that harley guy on a suzuki is not smiling, as they barely hit them cutting them off while not stopping on that stop sign. What's the big deal, they were in a hurry to be half a minute less late if they had to kill someone to do it, so people should watch out, especially those harley riders... buggers never smile anyways. Right?
Besides, it is my Harley and I smile when I want to