Why Justin Bieber was the worst SNL guest, according to Bill Hader and Jay Pharoah

Former Saturday Night Live cast members Bill Hader and Jay Pharoah appeared on Bravo's Watch What Happens Live with Andy Cohen, and revealed Justin Bieber as the worst behaved guest on the late night sketch comedy program.

"He just was in a bad place. Maybe he's in a better place, but back then it was rough," Hader said, adding "Everyone's usually on great behavior... Bieber's the only one, in my experience. I think it was just, he seemed exhausted or at the end of a rope."

Pharoah mentions witnessing Kanye West "yank" somebody during the taping of another episode. "That was pretty hilarious," he says.

Watch video of Hader and Pharoah's comments above via Exclaim!.