I recently took an interest in mountainbiking and got a bike. I've been babbling about biking to my workmates about cycling on the weekends and I decided to come into work by bike the two days a week that I can (the other days I have to pick up/drop off my daughters at grandma's so I need to use my car).
Well, two of my workmates took up the idea and have started coming in by bike 3 days a week each.