Zach Galifianakis. Justin Bieber. Two ill-behaved souls meet Between Two Ferns and things get ugly.

"It's really exciting to talk to you, especially right in the middle of your public meltdown," says Galifianakis.

When Bieber rolls his eyes, Zach gets testy. "Your young punk attitude is not gonna work in this interview. You understand me, son? Now, what was the last toy you received?"