Conor McGregor may be the world's most dangerous featherweight in the MMA octagon, but the 145-pound fighter is dwarfed when he faces strongman Hafthór Júlíus Björnsson. The giant Icelander, best known for playing Gregor "The Mountain" Clegane on Game of Thrones, weighs nearly three times that of McGregor, but the sparring match appears to be as friendly as they come.
The mismatched fight brings to mind one of the HBO show's iconic moments, Season 4's fight to the death between the Mountain and Prince Oberyn Martell, "the Viper," played by Pedro Pascal. Or if you're old school with a taste for kung fu, you might remember Bruce Lee taking on 7-foot-2 Kareem Abdul-Jabbar in Game of Death. Either way, it's an entertaining match.