+1 Have been cycle-commuting since February 1989 year round. The strangest comment in all that time was from a co-worker who asked derisively at the lunch table, "What are you trying to prove?" I asked, "Is there something in this that says I'm supposed to care what you think?" Followed by an uncomfortable silence for a while. Mostly, I try to answer questions w/t thought of encouraging them to try it out. I'm still waiting on my first convert.