Recently, I saw an ineffective movie called "Pressure," in which Dwight Eisenhower tries to predict how the weather might impact the Normandy invasion. The weather is not a great "big bad"--that's because you can't fight the weather. You just wait to see if it does what it seems to want to do. By contrast, "Jaws" is a masterpiece. You *can* fight a shark. The movie is structurally unusual. We begin with a town in its entirety. The mayor doesn't want to concede that a celebrity shark is dangerous--shutting down the beach would mean losing profit-making opportunities. (In this way, "Jaws" seems to be an ancestor of the buzzy series "Widow's Bay.") Meanwhile, local kids cause chaos by "becoming" the shark; they purchase fake fins and hide underwater. (Spielberg seems to be offering a self-portrait here; we perceive the director's empathy, his sense of a connection with his own childhood.) But here is what I m...