Confessions d'un Barjo (1992)

The narrator, "Barjo" (nutcase, crap artist), is an obsessive simpleton, given to filling his notebook with verbatim dialog, observed trivia, and oddball speculation on human behavior and the end of the world. When his house burns, he moves in with his twin sister, Fanfan -- an impulsive, quixotic egoist -- and her husband, Charles, the Aluminum King. Charles becomes the focus of the film, as his wife and brother-in-law bewilder him.