You might think you have a pretty good grasp on what makes an effective leader. You might even think you're pretty good at explaining it to others. But it's unlikely you can do a better job explaining it than this roughly shot three-minute video of a lone, shirtless guy dancing at a concert. The narration by Derek Sivers is spot on about leaders, first followers, popular movements and human nature. It has the insight and authority of a nature documentary narrated by David Attenborough.
You can read the transcript of Sivers' narration here.