I just found out about an event called The Mudathon. It is supposed to be in Indy, I think in June this year. It sounds pretty fun. It is basically a 5K run competely in the mud, with an obstacle course.
I guess the way it works is, at the end, you are suppose to donate your shoes to the group that runs the event, and they clean the shoes, and give them to the less fortunate.
And of course there is beer afterwards!!!!