It was twenty years ago today that Conan O'Brien debuted as David Letterman's replacement on NBC's Late Night. We marked the occasion yesterday by talking to Coco about some of the best early bits from the show's first few years. But there were other segments during those first months that were ... not as successful. Like the stuff going on in the clip below, in which Conan talks to the fake authors of a fake book about the hidden language of dogs. The two "authors" are first-year Late Night writers who would go on to bigger things: Robert Smigel, creator of Triumph the Insult Comic Dog and Saturday Night Live's TV Funhouse segments, and a not-yet-balding Louis C.K. This bit probably doesn't appear on their highlight reels, but it does capture the "let's try anything" ethos, which ultimately led to O'Brien's breakout. Happy anniversary, Conan!