Mandi Bierly
October 06, 2011 AT 02:36 PM EDT

Conan O’Brien, who’ll return to New York City to host his TBS show there the week of Oct. 31, made an advance trip to visit with Jimmy Fallon, who now shoots in O’Brien’s old studio. “That’s right, you were here for 16 years,” Fallon said on last night’s Late Night. “And then… what happened?” Watch the clip below.

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