The second stage consists of the actual delivery of the puppies. The third stage is passing of the placenta. The afterbirth might pass with each individual puppy, usually within 15 minutes of delivery. If the mother has a few puppies in rapid succession, those placentas may come out en masse.
Comedies have also been classified in various subgenres, such as romantic comedy, crime/caper comedy, sports comedy, teen or coming-of-age comedy, social-class comedy, military comedy, fish-out-of-water comedy, and gross-out comedy.
Screwball comedies, a sub-genre of romantic comedy films, was predominant from the mid-1930s to the mid-1940s. The word 'screwball' denotes lunacy, craziness, eccentricity, ridiculousness, and erratic behavior. These films combine farce, slapstick, and the witty dialogue of more sophisticated films.