Nice thought, but when you eliminate those talking on cell phones, eating egg mcmuffens, talking with their hands, putting on makeup, etc, almost all you're left with are the inattentive, drunk, on-drugs and non-rear-view-mirror-using.

I used to wave to other mcs when I rode my 80 KZ1000. Then, those on Hardleys would only wave to other Hardleys. Just keep my hands on the wheel now except for the occasional bird.