I just found out that Mark was one of the guys that played rugby in the I Love You, Man movie rugby scene. Unfortunately the clip didn't make the final cut, but apparently it's on the DVD as one of the deleted scenes. Watch the video below and see if you can figure out which one of the players he is. Hint: He's both in the huddle shot and one of the attackers.

Official Movie Site: http://www.iloveyouman.com/