Duck-tective

Duck-tective is a show that Mabel and Dipper watch at the beginning of "Headhunters". It is a TV show involving a crime solving sleuth duck, rather similar to Sherlock Holmes. The titular duck speaks only through a series of quacks which are translated in the subtitles, though the policeman that he is speaking with seems capable of understanding him. Grunkle Stan watches it later and calls the duck stupid despite Duck-tective having just solved the case of the murder. The policeman is heard in "Little Dipper", telling the duck he has gone too far this time.