Brian - who loves big lifted trucks, big tires, and playing in the dirt - sends us Mud Bog racing - a popular motorsport across the Southern U.S. - regulated by the American Mud Racing Association (AMRA) - where specialized off-road vehicles compete to drive through a deep pit of mud.  Tracks are straight trenches - typically 150 to 300 feet long - filled with a deep mixture of soil and water.  Drivers aim to cross the finish line as fast as possible.  If no vehicle reaches the end of the track - the vehicle that travels the farthest before getting stuck wins.  The AMRA sanctions classes for Stock - factory trucks and SUVs, Modified - vehicles with upgraded engines and suspension lifts, and Mega Trucks/Outlaws - custom-built monster trucks with tractor tires.
Great video here.