Zach showing Justin all the respect this young whipper snapper is due...
http://www.funnyordie.com/videos/ca8e174a54/between-two-ferns-with-zach-galifianakis-justin-bieber
http://www.funnyordie.com/videos/ca8e174a54/between-two-ferns-with-zach-galifianakis-justin-bieber