Hafþór Júlíus Björnsson is purely villainous as The Mountain, Game of Thrones' skull-crushing id, but he's a much gentler giant offscreen. When he's not dominating international strongman competitions, the 6'9" Björnsson finds time to dress up as the Hulk to terrify and delight little kids.

It was this 3-year-old's biggest birthday wish to meet his favorite Marvel hero, so Björnsson—who had never acted before Game of Thrones—agreed to have himself airbrushed green to play the role.

Unfortunately, his performance was a little too real for the birthday boy.

[H/T Digg]