UFC champion Tim Sylvia has a high threshold for pain. In a 2004 title bout, heavyweight Frank Mir trapped the 6'8", 260-pound Sylvia with his right forearm in a submission hold. Mir put his 240 pounds into the hold, Sylvia's forearm bent in an unnatural direction and, then, simply, snapped. The ref stepped in to stop the fight, even as Sylvia lifted Mir up and smashed his head into the canvas.