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To answer your question, no, that doesn't invalidate the effect captured here. However, if you are trying to duplicate this effect, you should realize that these things are probabilistic, and not deterministic, like so many phenomena in human society.

I didn't think it invalidated the effect. I guess I wasn't clear.

Contrast with this staged dance at the Antwerp Train terminal:

http://www.youtube.com/watch?v=7EYAUazLI9k

Maybe it took him dancing to all those other songs to get his first follower... Surely he had been noticed by many at the festival before he was unstoppable.

Yes. IMHO the party was started by the second guy.