What typical horror conventions appear in the opening of 'Jaws'...

Jaw clip- Crissies Last Swim

Ill base the codes and conventions based on whats shown in this slideshare:
http://www.slideshare.net/kbamediastudies/codes-and-conventions-in-horror-films

This Jaws clip is the perfect example that conforms to many codes and conventions of a horror film. To begin with the scene is set by a dark night...a stormy night is usually the cliche however I'd say the dark, moonlit sky gives off the same spooky atmosphere, especially the luminously back lit clouds which look eerie and storm-like and helps foreshadow something bad will happen. Not only that, they're also in a secluded location, an empty beach, this is shown by the tracking shot that shows the vast land in the background and no sight of housing, people or life. The fence on the beach its self provides a danger, with two drunk kids weaving in and out of them they could easily fall and injure themselves especially due to there drunk state. As they're running to the beach, clothes are coming off which re-inforces their reckless, out of mind behavior and suggests nothing good is going to come out of this. It builds up to 'the fall'  as one of the kids tumbles down the hill, which seems not enough to discourage him going near the danger but could be refered to as a 'fake scare'. The girl dives into the sea and swims off, getting further into the middle  of the ocean, reinforcing the secluded location and fact that no one is around to help. The boy talking to himself in a drunk slur builds up tension, it pulls the focus away from the girl however creates enigma, in wonderment of whats happening to her.

The non-diegteic music of the girl elegantly swimming implies something is about to tear up the peace. The water is glimmering ans the girl is throwing her head smiling, until something jerks her head, dragging her under water. A diegetic sound of spluttering is made to portray her surprise and her faster paced breathing as she begins the panic...then comes the terrified screams. This pulls all our focus to the girl and the audience feels engaged and tense. 

Last but not least, a death occurs within the first 5 minute of the film, which prepares the audience for the rest of the movie, with expectations to be filled with death, dread and fears, this is enough to hopefully keep the audience engaged and watching.