Nobody's Perfekt [sic] is a 1981 comedy film, adapted from Tony Kenrick's novel Two for the Price of One; Kenrick wrote the screenplay for this film.
[1] Three therapy patients — Dibley (Gabe Kaplan), whose memory often fails him; Swaboda (Alex Karras), who believes that his late mother is still alive and living with him; and Walter (Robert Klein), who has three personalities — want the city to buy them a new car after theirs is totaled by a pothole.
Legal means prove to be insufficient, so the three of them hatch a plan to extort the money from the mayor (Arthur Rosenberg).
A New York Times article on the 1981 box office mentioned the film as one that "sank in a weekend without a trace".
You can help Wikipedia by expanding it.This article related to an American film of the 1980s is a stub.