Seth Galifianakis Quizzes Sean Penn in Between Two Ferns

Zach Galifianakis is not the only member of his family to enjoy the media spotlight, as Zach's identical twin brother Seth sometimes stands in for him on talk shows when Zach is too busy with other commitments.

As Zach is obviously very busy gearing up for the release of It's Kind of a Funny Story, Seth took on the prestigious task of interviewing the Oscar-winning star of Milk, Sean Penn on Zach's own web show, Between Two Ferns.

Check out their conversation below: