20. Mean Girls (2004)

Chances of getting laid (1-10): 4. Hot chicks dressed slutty for Halloween, but they’re in high school. Oh, and the really hot ones are stuck up little bitches.

The drink situation (1-10): 5. Solo cups full of mixed drinks are de rigueur at this party.

Chances of police interference (1-10): 2. This one’s pretty tame compared to most of the parties on this list.

How’s the music? (1-10): 4. Do you remember “Milkshake,” by Kelis? How about Pink’s “God is a DJ”? Yeah, we don’t either. Bonus point for the film actually using a quality song in Blondie’s “One Way or Another.”

Didn’t you know that Halloween parties are really just excuses for hot girls to dress like complete sluts? Indeed, that’s pretty common knowledge these days, but apparently no one told Cady Heron (Lindsay Lohan).

While all her female classmates are in short skirts and cat suits and making out with each other in the hallway, she shows up to the party wearing her zombie bride costume. Brutal. Cady decides to drink away the humiliation of the moment only to forget her limits and drink so much that she ends up puking all over the boy she likes. Classy move, Cady. Classy move. Moral of the story? When in doubt, dress like a slut.