Do you pass the same people on your commute? Do you wave to them?
Everyday that I commute, I pass the same 1-2 runners, same rotation of 5 protesters at the women's clinic, and the same pedestrian. Even though I'm pro choice( I chose biking over running), I wave to all of them. Pedestrian doesn't wave back, but he does now ride a bike from time to time(on the sidewalk).