Jimmy Fallon and Zach Galifianakis traded places on 'Late Night'.
Galifianakis, who is continuing the rounds to promote 'The Campaign', conducted the interview as Fallon while the real host of the show answered questions portraying the bearded actor.
At one point, Galifianakis joked about his weight by telling Fallon: "I've noticed that you always gain weight for every role."
"But then you don't lose it after. So you just keep getting fatter."
Jimmy Fallon and Zach Galifianakis traded places on 'Late Night'.
