Excellent Post! I agree doing the small things starting with a slight smile

to a cashier, maybe someone around the office, or waiting in line is a great way to start getting over AA. Like you said its amazing how many IOIs you find yourself seeing.
I was at the gas station yesterday gettting myself a RedBull and a breakfast bar before I went in to work. There was a new cashier behind the counter, about my age, with red hair. I just gave a slight smile, and good eye contact. It must have been her first day and she was bummed but she seemed like she lightened up a bit afterwards.
A

and some eye contact can get you a long ways.