Barjo (1992)

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