Joseph.Santaniello writes:

I was thinking about getting one of these for goofing around, but
after a jerk driver tried to teach me a lesson today out on my ride
I thought such a thing would be nice to have to document each ride:

http://www2.oregonscientific.com/ass.../AT18_3_lg.jpg

Looks small enough, but once you put it on, it'll be years before you
meet up with another road jerk. However, if you get a picture, let us
know.

Jobst Brandt