The strangers thriller trailer

http://www.youtube.com/watch?v=x1TBlPelvb

The thriller trailer of the film The strangers begins with an establishing shot of a house in the giving us an idea of were the film will be based.

At the start the trailer using Transitions and fades,shows inside the house with candels and rose pettles on a bed from this the audience can be easily misleaded in to thinking that the movie could possibly be a romantic while introducing a male and female character in a two shot scene making it obvious what kind of relationship is between the them.
During my analysis I have identfied several conventions used in terms of dialog the two characters whisper there conversations at the start while the music is a soft piano piece is played giving you a relaxed,romantic mood.

Unexspectedly a bang or a gun shot occurs which breaks the romantic mood and could possibly give a thrill as it was not expected this gives the viewers the idea that something is wrong.
Leading from that the mood of the trailer changes as silence emerges leaving only the sounds of the wind blowing empty swings with the lighting of the scenes becoming darker to make it more chilling and the characters body language show fear and awarness.
Through out this change it lets the viewers now that the movie is inspierd by true events which will seem more realistic and shows the couple looking around having the thought they are being watched with slow tempo music creating suspence.This gives the audience the idea that this is a thriller as it begins to look mysterious.

Silence breaks out again when thers a long shot of the female character standing still looking around her when a character emerges from the shadows in a mask watchin her (0:48) this creates enigma codes for the audience as they would be wondering who the masked person is? and why they are watching the couple?.

It is realised that they are being watched but by 3 characters in masks making the audience wonder who they are and what do they want the silence is broken and a broken record is played .
The sub genre will be more i likely to be stalker thriller as the main characters are being watched to a point were violence and weponds appeare in the scenes with fades and fast cuts showing all the action of the characters showing alot of fear by being chased and stalked in and out of the house.

The music then cuts for a little short dialog at the end of th trailer which confusses the audience making them wonder even more who they are "Why are you doing this ?" asked by the female when the audience thinks it will give an answer that will make sence the masked killer replies with "Because your home".
This creates more enigma towards te audince as the trailer reveals no clues.