Teeth

Teeth, directed by Mitchell Lichtenstein, is a blackly funny horror film about a teenager with a vagina dentata. Once she discovers her 'mutation', she uses it to castrate the various male chauvinists who seem to populate her life. Her brother is a ridiculously over-the-top stereotype, though the other characters are all believable. The central character herself is sympathetic throughout 99% of the film, though her femme fatale smile in the final shot is out of character.