Zach Galifianakis Takes Justin Bieber ‘Between Two Ferns,’ Spanks HimZach Galifianakis Takes Justin Bieber ‘Between Two Ferns,’ Spanks HimIn the funniest 'Between Two Ferns' in quite some time, Zach Galifianakis takes on Justin Bieber, and gets him to confess he wants to be a time traveler.Emerald CatronEmerald Catron