Conan O'Brien Returns to His Old 'Late Night' Studio in New York (Video)

Frazer Harrison/Getty ImagesConan O'Brien Conan O'Brien returned to his old stomping grounds last night on NBC's Late Night With Jimmy Fallon -- and he reunited with an old friend. O'Brien, who left NBC last year after less than 12 months as Tonight Show host, dropped by Jimmy Fallon's late-night show, who films in his old studio in NY City. He will be in town doing some shows from the Beacon Theater. PHOTOS: 10 TV Shows Canceled Faster Than 'The Playboy Club' Fallon was discussing the fall weather, when O'Brien made a surprise appearance. "How you doin'?," O'Brien said to Fallon, who said, "This is unbelievable." "I was back in NY and I wanted to check out my old studio. Hey Max!" O'Brien joked, pointing to Questlove, drummer for The Roots. "Hair looks amazing, man." (He was referring to his Late Night/Tonight Show counterpart, Max Weinberg, who is not on TBS' Conan.) PHOTOS: NBC's New Fall TV Shows "You were here for 16 years. Then ... what happened?," Fallon asked. The two began to laugh. "Don't you worry about, you're a young guy," O'Brien joked. "I left something here, something important to me. ... I think I'm going to need it again," he said, before revealing Triumph the Insult Comic Dog. STORY: Jimmy Fallon Will Return to 'Saturday Night Live' as Host Watch the rest of O'Brien's appearance on Late Night below: Jimmy Fallon Conan O'Brien NBC The Tonight Show Conan TBS Late Night With Jimmy Fallon