We're all familiar with air and water shows--planes, helicopters, boats, all moving in formation. The participants can appear amazingly nimble for their size and speed. Popular Mechanics recently published an article highlighting a ballet performed by tanks as part of a recent Russian arms show. Read the article at http://www.popularmechanics.com/technology/military/news/russian-tank-ballet-video .
You can also find video of the tanks on youtube, at http://www.youtube.com/watch?v=jcT_fQIP6bU