During Spring Roundup 2008, our local cannon specialists treated us to an exhibition of their creation, a bowling ball cannon. Thanks to Reuben McCoy Rankin and Garrett Cade for the fun. Beware -- the videos below are very large files. I would not suggest trying to look if you are on a dial-up modem.
The AVI files are larger but better quality. If your computer won't play the AVI files, try the WMV files. If your computer won't play them, I can't help you other than to suggest you have the latest version of Windows Media Player installed.