Margot Robbie never got the “dress slutty” memo for Halloween. In fact, she tells W in her Screen Test, she prefers to dress up as boys because they have the “funnest, craziest characters.” One year she dressed up as Alien, James Franco’s character from “Spring Breakers” and was so convincing people asked to take selfies with her. Even Franco was impressed. “I felt pretty cool,” she says. Meanwhile, this year, many of her guy friends are going as her version of Harley Quinn.