In 2009 at the Sasquatch Music Festival in Washington State, a man named Colin Winter stood up on a grassy hillside. Everybody around him was seated quietly enjoying the music. He started to dance making a complete fool of himself.People were giggling, looking over their shoulder until someone else joined him. And then the third person joined and a fourth. Within a few minutes, almost everyone was on their feet dancing in complete joy.By that point, it was the people that were still sitting that looked out ...