http://www.youtube.com/watch?v=Vq6b9bMBXpg&feature=email
(Sorry, youtube doesn't allow embedding!)

With the advent of YouTube, performance art events that once would only have been seen by those in attendance can be preserved and circulated without limits. Prior to YouTube, performance art pieces might have been recorded via film or by photograph, but the experience of attending the piece was lost. While a video recording of a performance piece does not truly capture the experience, the video of the "spontaneous dance" also allows the YouTube viewers to see the reactions of those in attendance at the rail station and perhaps imagine themselves in the scene.
This video went viral fairly quickly, and the mechanisms that now exist for wide distribution totally change the way that people see performance art. This video is particularly great for its whimiscal nature, and its popularity shows the lighter side of art.