Rob Gronkowski and Marshawn Lynch are playing on opposite teams at the 2015 Super Bowl, but before the big game two of the NFL's most entertaining personalities got together for a bit of fun. Beastmode and Gronk made a guest appearance on Conan O'Brien's late night talk show for a segment called “Clueless Big Game Showdown.” Watch as the two face off in a battle of Mortal Kombat supremacy for Conan.