The Mountain from Game of Thrones spars with UFC champ Conor McGregor in this very intimidating video, which features two men who could kick our butts in vastly different ways.
McGregor -- the little dude featured in this footage -- is UFC's Interim Featherweight Champion. The Dubliner goes just 5-foot-9 and 145 pounds -- but all of it's pure terror. The Mountain, meanwhile, is actually in real life an actor named Hafþór Júlíus Björnsson. He's 6-foot-9, 400 pounds and moonlights as one of the strongest men in the world.