Death Race: 24 Hour Challenge Involving Tree Stumps, Memorization and Legos
The race itself is estimated to be 24 hours long, and involves some pretty rough mental challenges, at a point in time when participants are at a point of physical exhaustion. The video (above) is lengthy, but engaging enough to where I watched it all, start to finish.
Each racer has to haul their bike with them most of the time, along with a tree stump that they unearthed at 5AM. At a later stage in the race, everyone has to carry 20% of their body weight in rocks. Craziness.