Seeking vengeance (which is, really, the best reason ever to do anything) for the death of her mother, a sorta hot high school girl, with a vagina that has teeth that looks like a combination of eel and shark teeth, has sex with her stepbrother who is a total asshole. Her vagina bites off said asshole’s penis and it falls to the floor. The asshole’s dog then eats the bloody male sex organ. Hilarity ensues.
With intense penis-chomping and penis-eating action, this scene earns its spot in film history greatness.
*** This great moment in film history is from the movie with bite, Teeth.