Late Show (1977)

A clerk ends up in a movie theatre after an evening fight with his girlfriend and his motherly, dominant sister, with whom he lives. A film is running there that describes a situation that is strikingly similar to his: A young civil servant who lives with his dominant mother falls for a young Turkish guy, breaks with his previous life and his long-term fiancee, who works in the same office, moves in with the Turk. A new consciousness awakes in the mind of the clerk;