Prisoners - Trailer

Prisoners comes under the genre Crime/Drama/Thriller.

The main job of a Drama is to give the audience a subject that has a deep effect upon them. This is going to cause the audience to have a connection with what they see in the movie.
The job of a Crime film is to give the audience a sense of danger, with also the added plot of pursuing the criminal.
Finally the job of a Thriller is to effect the audience in a way that keeps them on the edge of their seat with anticipation.

The trailer open with a man and his family going to a house for Thanks Giving. This sets the audience in a situation which they are easily going to be able to relate to, this establishes the equilibrium. Now that they have made that relation to the audience they are going to be able to have the most effect upon them as what they now show is going to be able to affect them directly.

The children are shown going out to play, this makes means that the children are now vulnerable as the parents are not watching them. As a van drives along the street they introduce the music which fits the mood of vulnerability and foreboding. Now the parents realize that the children haven't been seen for a while and begin to question where they are, next we are told that they were seen playing on the van in which came alongside the music. This is where the audience now know what has happened before the characters. We now know that the Equilibrium has been broken.

This story plays on attacking one of the main focuses of human nature, to care for something. As humans we look to be able to take care of something and protect it, and when we see someone who is in a situation where they con no longer care for something it has a direct effect upon the audience. 

As this is a trailer we know that this will not show the end result of the film where either the equilibrium has been fixed or weather it remains broken. This appeals to the audience as this brings up the main question of 'what happens?' this is the main aspect the a trailer wants to evoke because human curiosity is something that is going to drive the audience.