La Poison (1951)

In a struggling French village, unhappily married couple Michel Simon and Germaine Reuver have grown to hate each other so much that they each come to the conclusion that the only way out of their misery is to murder their spouse. A brisk dark comedy, it economically uses its time to quickly establish the relationships among the principle characters and the quirks of the town they inhabit. While primarily focused on the central marriage, it also offers amusing criticisms of the judicial system and celebrity, with the villagers taking gleeful advantage of the notoriety of the resulting court case.  As a bonus, the beginning credits avoid the standard litany of names and instead the director introduces all of his actors while complimenting each one.