It's no secret that Steven Spielberg is a great big tease. He's a master of the slow build, giving audiences little glimpses and hints of a monster before finally hitting them with the thing all at once. In Jaws, you don't get the full effect of the shark until well into the film, when our unlikely trio of hunters -- police chief Martin Brody (Roy Scheider), marine biologist Matt Hooper (Richard Dreyfuss) and grizzled World War II vet Quint (Robert Shaw) -- least expect it. The mixture of shock, humor and dread that follows encapsulates everything that's great about this movie. Scheider plays it perfectly, famously ad libbing the oft-quoted line, "You're gonna need a bigger boat," without dropping his cigarette.