20. Hanna Marin (Ashley Benson) as Marilyn Monroe in Pretty Little Liars
Episode: "This Is a Dark Ride"
Air Date: 10/23/12
In the Halloween special airing tomorrow, the girls will board a Halloween ghost train (because who hasn't done that before?) hoping for some good, unclean teenage fun and instead get more than they bargained for. At this point, wouldn't it behoove them to forget bargaining and straight-up place bets on experiencing the most melodramatic, intrigue-filled, fucked up night possible? If every costume is as hot as Hanna's Marilyn Monroe, we're willing to just shut up and ride the crazy train with them.