The Purge

This is the trailer for 'The Purge', a physcological thriller being released in cinemas on May 31st.  This trailer starts of quiet, making the viewer uncertain about what genre the film may be.  It then starts to become louder with characters speaking and aggressive music to hint towards what the film is going to be.  There are then screen jumps and cuts with shots showing aggression and violence to confirm what genre this film is.
The trailer also tells us the release date of the fil mand that it is from the creators of the 'Paranormal Activity' films to attract the audience of that film as well as new viewers.