GOT's The Mountain takes on UFC fighter Gunnar Nelson

What would happen when the former world’s strongest man grapples with a jiu-jitsu black belt and UFC fighter?

That is exactly what Hafthor Bjornsson, a popular TV actor, tried to find out when he rolled with Gunnar Nelson in a video posted on the former's YouTube channel.

Bjornsson played Gregor "The Mountain" Clegane in the HBO series Game of Thrones for five seasons.

At the start of the video, they even re-enacted The Mountain's most popular scene in the series which is his duel with Oberyn "the Viper" Martell that was played by actor Pedro Pascal.

“I’ve been wondering for a long time because a lot of my friends have been saying that I have no chance against you on the floor,” Bjornsson told Nelson in the video.

The 6-foot-9, 340 pounds of muscle Bjornsson was breathing heavily just a few minutes into the grappling session. In the end, Bjornsson got choked out by the veteran mixed martial artist.  -- BAP, GMA News