The RIOT Wheel

We're guessing that he mainly did this so he could impress everyone at Burning Man last year, but a guy named Jake Lyall spent $5,000 and 900 hours building a massive 1,100-pound motorized monowheel (and we're not talking about some fancy unicycle, either). The RIOT Wheel (which stands for Reinvention of the Wheel) reaches a top speed of about 28 mph, but they're aiming to break the world record for the fastest single-wheeled vehicle with a new version this summe, though they might have some competition from the Embryo (assuming that no one gets killed first, that is).

[Thanks, Obi]