Appears in: The Creature from the Black Lagoon (1954)
Scariest moment: As the sexy Kay Lawrence takes a nice, casual swim, the creature stalks her from underneath the water, swimming parallel to Kay and ogling her.
Weakness: Sexy women wearing one-piece bathing suits. We feel you, Gill-man!

Before Steven Spielberg's Jaws turned the act of swimming into a fearful endeavor, director Jack Arnold's The Creature from the Black Lagoon made it impossible for women in the late 1950s to do the breaststroke without paranoia.

Set in an Amazonian jungle, Arnold's film follows a group of geologists investigating fossilized evidence of ancient sea creatures. When one of the modern-day descendants pops up to abduct one of the doctor's girlfriends, The Creature from the Black Lagoon shifts into a stalk-and-prey thriller anchored by the almighty Gill-Man, one of the freakiest looking creatures ever conceived. Extra props for Gill-Man's taste in women, too.