I don't know? Maybe because he thought that was Batman's girl, and since she already kicked Joker at the dinner party, maybe he wanted a little revenge? All your doing, is pure speculation, while I'm relying on what we have. And again, the deleted scene from the script backs up what I say.
While this is speculation, I don't believe that anybody could foresee that he would be captured by Batman, and also know that he would be in the interrogation room, just so he could tell him his plan about Dent and Rachel, to have them split up, and know that he would kill Rachel, and leave Dent scarred. Again, it makes MUCH more sense that he had a plan to kill Rachel and Dent, because he thought Dent was Batman, and maybe he wanted them to know that they were both about to die, but couldn't help themselves, as they were in separate rooms.
Either way, Joker thought Dent was Batman, and he was a "man of his word", and was out to kill him. I find this hard to deny, because if you didn't pick this up in the movie, then you should at least see it with the deleted scene form the script.
No, he did that before The Tumbler hit the garbage truck. And normally when someone says "hmmmm", it's not out of excitement, it's out of realization/confusion.
No it wasn't, and you can't say that for a fact. And yes, The Joker said those things, but he also said, "it's simple. we umm, kill the Bat-Man". He already had a motive and a desire to kill Batman. He then started having fun, realizing that Batman was actually a few steps ahead of him, and that's when he said it in the interrogation room. And while all that is speculation, once again, what
isn't, is one of The Jokers last lines in the movie when he said, "
you don't think I would risk loosing Gothams soul, to win a fist-fight with you?". There it is, in black and white/clear as day! Of course all these things are going to get Batmans attention, but that wasn't The Jokers motives. There's a HUGE difference there, and you either can't see it, or are to stubborn to acknowledge the fact. This is just something that can't really be debated, as it's evident with his last line.
Of course he wants to cause as much chaos in Gotham, and that was his point(ie. to cause
chaos and anarchy throughout Gotham, while showing them how corruptible they can become). And yes, he messed with Batman, but that wasn't his overall desire, want, or need. His needs were to show Gotham how truly corruptible it could become.
Look, I'm not saying that The Joker and Batman didn't fight, or get entangled in heated battle, but that was never the reason. The Jokers motives were to send a message to Gotham, and Batman got in the way. It was never to get Batmans attention, while Gotham got in the way, it was the complete opposite. I don't know how else I can say this for you to understand?
