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:

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  • Will Ferrell & Zach Galifianakis Promote 'The Campaign'

    HOLLYWOOD, CA - AUGUST 02: Actors Zach Galifianakis (L) and Will Ferrell arrive at the premiere of Warner Bros. Pictures' 'The Campaign' at Grauman's Chinese Theatre on August 2, 2012 in Hollywood, California. (Photo by Kevin Winter/Getty Images)

  • Will Ferrell & Zach Galifianakis Promote 'The Campaign'

    HOLLYWOOD, CA - AUGUST 02: Actors Zach Galifianakis (L) and Will Ferrell arrive at the premiere of Warner Bros. Pictures' 'The Campaign' at Grauman's Chinese Theatre on August 2, 2012 in Hollywood, California. (Photo by Kevin Winter/Getty Images)

  • Will Ferrell & Zach Galifianakis Promote 'The Campaign'

    WASHINGTON, DC - July 31: Will Ferrell and Zach Galifianakis joke around as they attend 'The Campaign' premiere at The Newseum on July 31, 2012 in Washington, DC. (Photo by Larry French/Getty Images)

  • Will Ferrell & Zach Galifianakis Promote 'The Campaign'

    CHICAGO, IL - JULY 18: Will Ferrell (L) and Zach Galifianakis read the starting lineup for the Chicago Cubs before their game against the Miami Marlins at Wrigley Field on July 18, 2012 in Chicago, Illinois. (Photo by Brian Kersey/Getty Images)

  • Will Ferrell & Zach Galifianakis Promote 'The Campaign'

    CHICAGO, IL - JULY 18: Zach Galifianakis (C) and Will Ferrell (L) stand on the field before throwing out a ceremonial first pitch to Ryan Dempster #46 of the Chicago Cubs before the game against the Miami Marlins at Wrigley Field on July 18, 2012 in Chicago, Illinois. (Photo by Brian Kersey/Getty Images)

  • Will Ferrell & Zach Galifianakis Promote 'The Campaign'

    LOS ANGELES, CA - JULY 17: Actors Zach Galifianakis and Will Ferrell attend the press conference for the launch of Warner Bros. Pictures' 'The Campaign' Whistle Stop Tour, held at The Grove on July 17, 2012 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)

  • Will Ferrell & Zach Galifianakis Promote 'The Campaign'

    Actors Will Ferrell, right, and Zach Galifianakis attend a special screening of "The Campaign" at the Sunshine Landmark Theatre on Wednesday July 25, 2012 in New York. (Photo by Evan Agostini/Invision/AP)

  • Will Ferrell & Zach Galifianakis Promote 'The Campaign'

    Zach Galifianakis and Will Ferrell attend "The Campaign" photo-op at the Grove on Tuesday July 17, 2012, in Los Angeles, CA. (Photo by Todd Williamson/Invision/AP)

  • Will Ferrell & Zach Galifianakis Promote 'The Campaign'

    Actors Will Ferrell, left, and Zach Galifianakis attend the press line for "The Campaign" during Comic-Con, Saturday, July 14, 2012, in San Diego. (Photo by Matt Sayles/Invision/AP)