Star Wars Uncut: what happens when someone gets the looney tunes idea to recreate the original movie, shot-for-shot...crowdsourced.
http://www.starwarsuncut.com/trailer

Japanese cafe service as performance art:
http://www.cabel.name/2009/09/kashiwa-mystery-cafe.html

Ornithology as performance art...in reverse:
http://www.youtube.com/watch?v=9T1vfsHYiKY

And to finish up, a music video involving Carl Sagan and autotuning...which is much cooler than it sounds:
http://www.youtube.com/watch?v=zSgiXGELjbc