Andy Samberg and John Mulaney interviewing each other is sheer chaos

"We were really expecting to just be guests like a few hours ago."

These are the words of Wednesday's guest-abruptly-turned-co-host of Jimmy Kimmel Live! Andy Samberg, as he gleefully fills in for an absent Kimmel by interviewing other guest-turned-co-host – and his co-star of the upcoming movie Chip 'n Dale – John...