Will Ferrell and Zach Galifianakis swung by "The Daily Show" Thursday to promote their new political comedy "The Campaign," and their interview with Jon Stewart started out pretty traditionally.
They opened with a question about on-set pranks, and the actors gave their respective answers, but things got tense when Ferrell called Stewart's questions "lame." An argument broke out between the host and guests -- and an unfair one, considering it was two against one -- so Stewart called in his big guns.
He went HAM on them. Or should we say Hamm.
Jon Hamm surprised everyone by walking on set and evening out the playing field a little bit. He may have agreed that the questions were lame, but his support gave Stewart enough confidence to call Will Ferrell a "baby-punching motherf*cker."
Watch the full clip above for all of the improvised glory.
ALSO ON HUFFPOST:
HuffPost Entertainment is your one-stop shop for celebrity news, hilarious late-night bits, industry and awards coverage and more — sent right to your inbox six days a week. Learn more