Last night on Late Night with Jimmy Fallon, Justin Timberlake goes back in time to impersonate Jimmy Fallon on his first-ever talk show. Then it's déjà vu all over again with their new, body-popping performance of "History of Rap Take 2". Plus: Rupert Murdoch and marijuana have played integral roles in Roseanne Barr's sanity; Steve Carell says that leaving The Office is like "everybody else is going back to school, and I've graduated," and then proceeds to declare, "Screw the show!"; and Kyra Sedgwich once considered homicide using a poison potion on her bullies. Watch our compilation to see what you missed.