Genre and Sub Genre

A film is nearly always based on a certain genre. Genre is an overview of the styl of film it is. A style of film (genre) is a quick brief overview of what the film is or is about.
The most common genre's for a film are:
Romance, Comedy, Action, Thriler, Tragedy, Science fiction, Drama, Horror & Fantasy.
A film can also have an sub genre. A sub genre is when there's anothe genre intergrated with in the main one. For example romantic comedy's, ( rom-com). A rom com is usually an all romantic movie with some comedy with in the film.           

The stepfather (2009)
The stepfather is a film about  an evil man who tricks family's into thinking he's the loving special stepfather but decides to decieve them by killing them. The film's main genre is a thriller. The film is also an thriller - horror as it is a movie that causes you too jump and sometime's fear for the worst. The way the film is recorded sometime's leaves us not knowing what is going to happen next.
One thing that inspires me about the film is that it has a lot of intertextuality with other films, for example (Phsyco). One way we see the intertextuality in the film is the knife being used by the killer to attack his victims ( the family)
The picture on the left shows us the knife he uses to try murder the family, the same shaped knife used in Pshyco (bottom picture).
The director of Phsyco has influenced many  other directors with the mis-en-scene he has used, from the shower cap shots, to the white curtains, to the shape of the knife and the white towels used in his stabbing scene.