Brainstorm

Conventions of any genre opening scene

Details of cast and crew.
The film's title.
An introduction to character or character type.
Indication of place.
Indication of historical period.
Information regarding mood and tone.
Introduction to signature theme tune.
Information about genre.
Questions that the viewer finds intriguing.
Patterns and types of editing that will be echoed in the remainder of the film.
Mise en scene and cinematography that will be echoed or elaborated upon later in the film.