In "Arcadia" (Episode #132), when Mulder and Scully go undercover to find out why members of a California home owners association keep dying mysteriously, they take a page from The Dick Van Dyke Show (1961-1966) and use the aliases Rob and Laura Petrie -- the characters played by Dick Van Dyke and Mary Tyler Moore in the classic sitcom. Fortunately, none of the neighbors catch on -- apparently, they've never seen the show.