Dirt bike / bicycle?

[Lonesome Dave]

We've seen this before around here, but you buy one in Colorado. 

http://denver.craigslist.org/bid/4779343652.html

[Bogus Jim]

Hmmm... looks too heavy to pedal very far but just enough engine power to really get hurt.   

[tannerc]

All 21 gears available? Even if you have to stop to shift. I say fun, but I think most anything with an engine is fun