Custom Lawn Choppers
Treehugger has assembled a delightful gallery of custom riding lawnmowers. And because it's El Hug, you know they have to be powered by humans. I think reel mowers are great, but I can't help but think attaching one to a bicycle would make them more difficult to use, not easier. But who knows!
The Cutting Edge: Bicycle Lawnmowing [Treehugger.com via Gadget Lab]

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It would probably make it easier if the pedals also drove the reel, but as that one is set up, I can't imagine it working well..
As first seen in Victor Papanek's "How Things Don't Work."
The reel on such a mower is driven by its wheels; as long as you propel it forward, that's no problem.
However, given a bicycle with two front wheels and a non-vertical head-tube, turning will be impossible.
I just want to say that is one of the straight up best dudes I've ever seen in my life.