Even bad guys have a beginning, Aaron Eckhart said of his role as district attorney/ super-villain Harvey "Two Face" Dent in the upcoming "Batman Begins" sequel "The Dark Knight." "There's an evolution to my character, how he becomes what he becomes," Eckhart revealed. "It'll be different in that you'll see different sides to Harvey that you haven't seen before." And Dent should know about sides. Permanently scarred when a criminal throws acid in his face, Dent is rendered forever duplicitous his better instincts in a constant fight with his dark side. In previous incarnations of the character, this was represented by having Dent flip a coin to decide how he was going to act. Does this mean Eckhart has been practicing his flipping motion? "I may be," he slyly said. Eckhart will next be seen in "No Reservations," co-starring Catherine Zeta-Jones.