Well I finally figured out that that funky bike I saw at last month's Critical Mass was called a "lowracer". It actually differed from this one pictured in that the guy was between the wheels and had his feet up in the air. I can't imagine how fast these things could get goin'*, and as a former go-karter, I know that perceived speed increases as you get closer to the ground. It must have been a real treat for this guy to bike on city streets, since in traffic he'd be a smear. He could ride right under an SUV!

That picture came from this site. Check it out, lots of weird bikes there. Make sure you click on the picture at right to see this wacky tridem, which has only one crank for all three riders. This site seems to be dedicated to the funky things people build in order to go fast under their own power.

*70 km/hr on rails, according to this site.