When you hire chronic Ferrari-hellion Justin Bieber to host an episode of "Saturday Night Live," not-funny things are bound to happen. Like, for instance, this sketch, which Bill Hader describes as "the greatest trainwreck ever" in his helpful blow-by-blow commentary. Favorite moment: Hader explains how the stage manager urged him to "keep going" after the diminutive teen idol was nearly crushed by a wall. Second favorite moment: Justin Bieber is gripped by fear as he is nearly crushed by a wall.

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