When I first heard Justin Bieber team up with Mariah Carey for their version of "All I Want For Christmas", I thought, what an odd combination. Multiply that times ten for this odd get-together. Watch Zack Galifianakis interviewing Justin Bieber for his make believe talk show, between two ferns. This is priceless and awkward to say the least.

Funny or Die also provides us with other odd interviews with Zach and various celebrities. This particular interview has received almost 2 million hits on you tube and is still going strong.
WARNING: LANGUAGE. May not be suitable for work.