Science, industry, and wealth have allowed many of us humans to pursue excursions into bizarre, but logically possible and physically realizable, realms.
One of these is the world of unicycles. A couple of decades ago, I was pretty proud of myself for having juggled while riding a unicycle (for about five seconds, before I dropped the balls and fell). But that's something most people could learn, if they had a couple of weeks with nothing better to do. But some people obviously have more time and talent- I did some googling on the current unicycle scene, and came up with some amazing stuff.
This is a clip of the so-called "ultimate wheel"- a unicycle without a seat, that is, just a wheel with pedals attached. For anyone who's tried a unicycle (not all that easy), not having a seat to prevent the wheel from simply flopping around obviously introduces a whole additional set of control problems. Hats off to this guy: