"A bomb is under the table, and it explodes: That is surprise," said Hitchcock. "The bomb is under the table but it does not explode: That is suspense." Spielberg leaves the shark under the table for most of the movie. And many of its manifestations in the later part of the film are at second hand: We don't see the shark but the results of his actions. The payoff is one of the most effective thrillers ever made.