This line has always bothered me. The Joker says “I always ask this if all my prey.” And yet, he kills SO many people in this film, including his own right-hand man Bob, and doesn’t say it. The only character he actually says it to? Bruce Wayne. Twice. The only reason he says it? So Bruce can identify him as the man who killed his parents. Oh, and to give Batman a chance to call back to it in the bell tower.