The Creature from the Black Lagoon

Neatorama: "It plays on the basic fear that people have about what might be lurking below the surface of any body of water. You know the feeling when you are swimming and something brushes your legs down there. It scares the hell out of you, if you don't know what it is. the fear of the unknown. I decided to exploit this fear as much as possible." -Jack Arnold, director of The Creature from the Black Lagoon