Matthew Morrison, 34, certainly comes across as Mr. Nice Guy teacher on Glee, but it turns out that when the cameras are off the claws come out! His target? Jonah Hill, 28, -- who definitely didn’t let him get away with it. Hill went on Late Night with Jimmy Fallon in September, and admonished Morrison for giving him a hard time first at a FOX event, and later at a "douchey Hollywood party." After hyping up the audience with the story, they broke out into cheers, while Hill stood up and said, "I call dudes out on Jimmy Fallon. "I’d love to see him sing his way out of this one." Wish granted! Morrison accepted Hill’s challenge and created a Glee-style response that aired on Fallon. "Be very afraid," Morrison jokingly threatened, "because nobody messes with someone from musical theater!"