http://www.youtube.com/watch?v=GUZuyMVdVccOver the years we've come across some weird and wonderful extreme sports - hangboarding, extreme pogo, wheelchair riding, flyboards, rollercoaster rollerblading and a dude doing trial biking on a ladies vintage bike. Here's yet another bizarre one to add to that list; forget downhill mountain biking - this is extreme mountain unicycling.

Yes that's right, these two nutters have ditched their perfectly adequate two-wheeled transportation in favour of an all-round more challenging (and rather ridiculous) pastime. You have to admit it does look petty hard but when it comes down to it, we think this Youtube commenter put it best:

"Cool and all, but you do look like a couple of spastics inching down the mountain flailing your arms about."

Legitimate extreme sport or pure comedy gold? Either way you're going to need some seriously hardy groin muscles to take it up...