For all those who once thought they had good balance, I present 6 minutes of footage that proves not only are you less than average, but you will never even glimpse average performance in your lifetime. Normally I give up on videos after a minute or two, but this one demands you watch until they are done, for fear they might get your IP address and come ask you pointedly why you didn't watch all the way through.
http://www.bestofvids.com/video/amazing-bicycle-skill/
http://www.bestofvids.com/video/amazing-bicycle-skill/