I'm not really into extreme sports, but you've gotta be impressed by this video.  Watch some of the coolest stunts you'll ever see on two wheels.

The man under the helmet is Danny Macaskill and it's amazing what this dude can do.  I know he's not getting huge air or doing 3 backflips, but the dude rides a bike down an effin tight rope.  This guy is ridiculously  awesome.