Mark this down under "things to be sure to do next October" -
The 5th annual, 2012 Lake Orion Pumpkin Launch was a blast. It was held at Orion Oaks park, about 90 minutes from Ann Arbor. Five teams competed to launch pumpkins with trebuchets out into a field. The winning team, the Masters of Mayhem, lobbed a pumpkin over 1300 feet (a quarter of a mile).
Pictures when I have them...for now you can see the winner's Facebook page, the Masters of Mayhem, for some videos.