I used to quite a bit. I would chase the drivers to catch them at lights; I would get into arguments; I once threw my bike in front of a car to block the driver from driving away and so we could have, ummm, a chat about why intimidating people with a two-ton vehicle is a ******bag move... I may have gotten some drivers scared of confrontation with cyclists, so maybe they thought twice the next time they wanted to harass a person on two wheels, but it wasn't doing me any good, psychologically.

So I stopped all that. I can't guarantee I won't do it again; sometimes I'm tempted, and there might be a situation when I'll feel confronting the driver is the right thing to do. However, for the most part I just shrug it off these days. The more biking years I accumulate under my belt, the easier it gets for me to predict what a moron cager might do, so I can figure out a way to avoid that scenario. I also wonder if drivers actually respond better to cyclists now than, say, 10 years ago, since cycling is slowly but steadily growing as a mode of transportation in Toronto.