You may not know Halfthor Bjornsson by name, but you probably know him by frame—the 6'9", 419-pound frame that plays Gregor "the Mountain" Clegane on HBO's Game of Thrones.
He won Europe's Strongest Man in 2014 and 2015, and was runner-up in World's Strongest Man in 2014.
And yet, he can't beat a guy almost 200 pounds lighter than him in arm wrestling.
That's because the 225-pounder in question is Devon Larratt—formerly of the Canadian Special Forces and now a two-time WAL heavyweight arm wrestling champion.
Despite the considerable weight disadvantage, Larratt proved that arm wrestling is a sport that requires technique and skill rather than just brute strength.
Always down for a laugh, Bjornsson graciously celebrated Larratt's easy victory, probably because he knows what would happen if they really went at it away from the arm wrestling table.
(Game of Thrones Season 4 SPOILERS!)