The Riot Wheel
Monstrous mechanized unicycle.
It looks like a prop from a Mad Max movie, but it moves really slow. However, it's lack of speed doesn't make this thing any less testosterone inducing. The people behind this ultimate big wheel are trying to go for a new land speed record for a single-wheel vehicle.
So learn more about The Riot Wheel at their site.
Direct video link of the wheel in action: [here]