What earlier concept does the style of comedy that The War of the Roses employs correspond to?
gallows humor
Title: Black comedy
Passage: Black comedy or dark comedy is a comic style that makes light of subject matter that is generally considered taboo.  Literary critics have associated black comedy and black humor with authors as early as the ancient Greeks with Aristophanes.  Black comedy corresponds to the earlier concept of gallows humor.
Title: The War of the Roses (film)
Passage: The War of the Roses is a 1989 American black comedy film based upon the 1981 novel of the same name" by Warren Adler.  The film follows a wealthy couple with a seemingly perfect marriage.  When their marriage begins to fall apart, material possessions become the center of an outrageous and bitter divorce battle.
Title: Mercedes-Benz G500 4×4²
Passage: Mercedes-Benz G500 4×4² was an earlier concept vehicle bought into production in 2015.  The vehicle was fitted with 4.0-litre bi-turbo V8 petrol engine delivering 416 bhp and 450 lb ft of torque.  The model is the shorter and practical version of Mercedes-Benz G63 AMG 6x6.
The War of the Roses (film) Black comedy