Shown below is a slide share presentation that i found which shows all of the conventions of a horror trailer.
Most horror films will use the following type of conventions shown in the presentation above, also the conventions that are shown below, however many chose to bypass these.
-Unusual scene setting in some sort of isolated location
-Dark/shadowy lighting
-Typical female victim, as shown on the image below is a scene from the world famous movie 'Psycho'
-Sub plot of male/female relationship
-Defeating the moster, or thing that needs defeating in the movie, this also happens otherwise the monster would just eat you (which would be know good to watch as it would be a rubbish ending) in my opinion.....
-Disruption of normality
