2 minute opening of a feature film

What do we expect to see in the opening 2 minutes of a feature film?

Usually in the opening of a film we are introduced to one or more of the main characters of the story, they are usually going about their everyday life or involved in something more interesting and exciting that will be developed upon throughout the rest of the film. The opening two minutes of a film also usually introduce the plot of the film and indicate to the viewers which genre the film is. This can be introduced through dialogue, mise-en-scene, music or just the actually events that are taking place i.e. if the film begins with a high speed car chase the viewer can assume that the film will probably be a crime thriller.