Because you like David Kesller in An American Werewolf in London

After having his mind altered after a bad breakup, Joel Barish is not convinced that ignorance is bliss. See them in Eternal Sunshine of the Spotless Mind.

Rose Tyler may have not done too well in school, but she's certainly holding her own in space. See them in Doctor Who.

His name is Chucky, and he's your friend till the end. Hidey-ho! See them in Child's Play.

A Vietnam vet, Travis Bickle spends his days driving his taxi and watching porn flicks. See them in Taxi Driver.

Brilliant but self-destructive, Lip Gallagher spends more time stirring up trouble than hitting the books. See them in Shameless.

Alex DeLarge likes his favorite milk-based, drug-laced cocktail. It helps him get in the mood for a night of "ultra violence." See them in A Clockwork Orange.

Told her son will one day save the world, Sarah Connor dedicates her life to training him to do just that. See them in The Terminator.

Ellen Ripley defines the word "badass." When she's not leading her crew on an interstellar voyage, she's slaying terrifying creatures. See them in Alien.

Clementine Kruczynski thinks that too many guys think she's a concept, or she completes them, or she's gonna make them alive. See them in Eternal Sunshine of the Spotless Mind.

The Terminator is an emotionless killing machine who won't stop until he's changed the future. See them in The Terminator.

Adults call him troubled and kids call him crazy, but Donnie Darko is too busy following the instructions of a giant bunny rabbit to care. See them in Donnie Darko.

Shaun is used to being lazy. And now, you're asking him to fight for his life? See them in Shaun of the Dead.