South Korea: Boys cheering for their soccer teams. The most amazing thing is that they do this with their CLOTHES (not holding up cards). they have a jacket that is one color on the back, one on the front, and that they can open or close to show a third color shirt on the inside. One school has also figured out how to use their pants to make shading.

Original video: http://www.youtube.com/watch?v=tipHJlLUzNk (less info)