God, how I love this movie. Definitely a top 5 film of all time. It's still amazing to think that when this came out, people literally became frightened of going in the ocean. They actually stayed away from the water for awhile. That's a powerful flick.
It also essentially invented the summer blockbuster, for better or worse. This was truly a historic film.
My favorite line? Just before the bigger boat line, Brody, as he continues slopping chum in the water, says, "Slow ahead? I can go slow ahead, come down here and chum some of this ****!"
Oh, and interesting bit of trivia: Roy Scheider ad libbed that line about needing a bigger boat.