This makes me want to get a fixie. Nevermind the fact I'd need a lot more help than just the bike to become an acrobatic-cycling-dancer-gymnast.

From this year's European Junior Championships:
Female pair: http://www.youtube.com/watch?v=b36Yi-Pb1wM
Solo male: http://www.youtube.com/watch?v=b1t3oyL0ihk

aaaand bonus (maybe from a different competition?)--6 female unicyclists!: http://www.youtube.com/watch?v=WyIaxYzurdI