Zach Galifianakis stopped by "Late Night with Jimmy Fallon" last night to promote his new film, "The Campaign." The interview didn't go as you'd expect.

Galifianakis and Fallon switched places, and the two attempted at first to act like each other before Galifianakis just became his persona from "Between Two Ferns." He yells at Fallon, his first question is, "How was your flight?" and he pretends to not have a clue what "The Campaign" is. It's great. Take a look below.