05/13/12 Images from the Tough Mudder obstacle course race at Pocono Manor, PA on Sunday. See that giant wall everyone is climbing? Every so often, a worker pours huge amounts of cooking oil down from the top.

“Tough Mudder events are hardcore 10-12 mile obstacle courses designed by British Special Forces to test your all around strength, stamina, mental grit, and camaraderie. With the most innovative courses, half a million inspiring participants, and more than $2 million dollars raised for the Wounded Warrior Project, Tough Mudder is the premier adventure challenge series in the world.”