Fresh off a return to his old Saturday Night Live stomping grounds as guest host, Bill Hader was letting names drop about previous celebrities in that slot, reports ABC News. During an interview with fellow SNL alum Jay Pharoah, the pair were asked "Who was the worst-behaved musical guest or host [during] your time at SNL?" "I mean, we both know, dog," said Pharoah. "Yeah, it was Bieber," Hader said, continuing, "He just was in a bad place.... Maybe he's in a better place, but back then he was in a very ... it was rough. Everybody's usually on great behavior.... Bieber is the only one in my experience ... he just seemed like exhausted or just at the end of a rope. I mean, he was just so huge." (More Saturday Night Live stories.)