I was walking down the street with a friend and his dog today discussing some semi-recent research about smoking helping to give you Alzheimer's Disease on top of everything else it does to you. (Roughly doubles your chances.)
Anyway, some lady from across the street that I've never seen before starts screaming at us about being arrogant kids who think we know it all. I'm surprised that she even heard us talking, but she did, and then went into the whole "I've been smoking 20 years, I'm sick of people saying it's bad, blah, blah, blah, AND that we should mind our own business."
I tried to remind her that she wasn't minding her own business by deciding to jump into our conversation from across the street, to which she just said that it was a public street. She started to rant some more so we just gave her the ol' fuck you, middle finger, and left.
I will say it made a normally dull dog walk a bit more fun, and it also gave me a house to harass when I'm drunk at 2AM. (Yes, drinking is also bad for you, but comparing drinking twice a month to smoking even 1 cig. a day is ridiculous.)