Link to Shaun Of The Dead Teaser Trailer: http://www.youtube.com/watch?v=BXyLlpLnq6w

The trailer kicks off with a very important message "our nation is in crisis" as one may expect this to be a comedy film this is a worrying first message. There is no specifically obvious establishing shot as the trailer starts off with a sort of broken TV creating a spooky feeling as there is something wrong with the network (this may be spooky as in many horror films suspense is created by an electricity cut or something along those lines). To straight away show the 'Shaun' is an average man there is a framed picture, some wooden furniture and Shaun in the reflection of the TV in his work clothes. It quickly brakes onto a blurred image of an ambulance giving the viewer the feeling that something isn't right. Very quick shots of strange deformed people show up on the screen. "A state of emergency has been declared" the viewer is on edge and doesn't know what's going to happen. 

As soon as the camera cuts onto the two main characters the trailer is transformed back into a sort of comedy film due to the facial expression and general mise en scene. As the trailer progresses Shaun's actions become more and more stupid really drilling in the comedy theme, thus specifying the target audience.

Shaun flying over a Garden fence.