Jaws

On the island of Amity, the new police chief Martin (Roy Scheider) discovers the remains of a shark-attack victim. He attempts to close the beaches, but with the Fourth of July holiday approaching, the Mayor insists closing them will decrease the tourism income that they all heavily rely upon. Shortly after, a young boy is killed by the shark while playing at the beach, and his distraught mother puts a bounty on the shark. Quint (Robert Shaw), a local fisherman, says he will kill the shark; and with Martin, as well as a marine biologist (Richard Dreyfuss) tagging along, they set out to catch the monstrous great white. 

The shark's presence is only hinted at during most of the film, by showing only its fin or its  shadows, adding to the film's intrigue and suspense. It's very Hitchcock-esque, yet, it was not what Spielberg had originally intended, but as a last-resort after the mechanical sharks failed to work. The Da-na, Da-na, high register music that is played when the shark approaches, only enhances the suspense; it is still used in scenes expressing impending danger. It is thought that movies that feature a "monster" killing everyone in sight are typically considered Trash Cinema or B-Films, however with the cinematography and Spielberg's directing, it instantly became a classic and the first summer blockbuster. The limited amount of gore leaves your imagination to fill in the gaps and makes the movie that much better.