Morgan Spurlock's 2004 documentary, Super Size Me, is available on YouTube for all to watch. Spend 30 days eating nothing but McDonald's fast food and what happens? It's not pretty. But you'll get the picture in an entertaining 100 minutes. Super Size Me was nominated for an Academy Award, and won prizes at Sundance and elsewhere. Give it a watch. And note that you can now watch other feature-length films on YouTube here. You'll find some good ones in the documentary & biography section.