Zach’s quizzes Brad on everything from when he lost his virginity to why he doesn’t take showers.
At one point, Zach feels he needs to lighten things up, so he brings Louis C.K. out for a bit of standup, later Brad and Zach share a piece of gum.
Perhaps the most surprising moment came when Galifianakis started making references to "Friends."
FunnyorDie.com just released an incredibly funny and awkward episode of “Between Two Ferns with Zach Galifianakis” featuring Brad Pitt!