The Joker put his hands to his mouth, looking obviously insincere as he trembled in terror at the Batman's approach, stepping back to the edge of the roof. "Oh, no! I'm stuck between a rock and a hard place, aren't I? Whatever will you do to me, Batman?" He held out his hands, pleadingly, "You aren't gonna beat me up, are you?"

Then he laughed and threw out his arms, "Oh, wait, too late for that. You know, it's been really fun, but I think I left the stove on and you know how Harvey is with fires. Better go check in on him."

With that, he spun on his foot and promptly took a great big step out into the open air. Oh, escape plans.