Interesting and nervewracking story for event organizers... A racer in a mud run used a friend's bib, thus never signing a waiver nor establishing any other official relationship with event organizers (not that waivers carry much weight in the U.S.) He "jammed" his hands and arms in a mud pit that he was supposed to crawl through and ended up paralyzed. He's suing for $30M + legal costs. Wow.
http://www2.timesdispatch.com/news/2012/may/17/tdm...