Some of my Michigan friends enter a team every year into the Dances with Dirt Relay in Hell. I had seen this event a couple of years ago when I went down to run the ultra and thought that driving around all day in a van with my friends sounded way more fun than running by myself for hours. They have had the same team for years but I got lucky as one of the team members got afflicted with pregnancy and I got to take her place this year!
The race has 15 legs and everyone is supposed to run 3 of them. My team likes to keep it interesting by drawing names out of a hat, so you don't know until a leg or two before if you are running or not. Given the heat, I got SUPER lucky by drawing all three of my legs before 1:00, which meant I got to relax after that and drink beer.
Each leg has a name based on the features of that leg:
http://dwdhell.com/index.php/relay/course-descript...
I ran the very first leg, appropriately called Stampede, which was fast and furious and a nice mixture of double and singletrack with a little off trail thrown in at the end.