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On a bike that doesn't go backwards when you backpedal..

I personally haven't ever seen a bike that goes backwards when you backpedal. @dangrossman, thanks for the info -- TIL.

A fixed gear bike will do that, and they're not terribly uncommon. http://www.youtube.com/watch?v=DsmYe6Hxg0c

If you visit SF, there are hipsters on fixies all over downtown.