This scene makes me laugh every time I see it. I know that sounds pretty screwed up, but come on! It was great. It was also the first indication that we were going to get a darker and more insane Joker than the Joker that Jack Nicholson gave us in Batman (1989). The magic trick demonstrated here was little league in comparison to where Heath Ledger took The Joker.
If you have a scene that you would like featured, drop me a mail at firstname.lastname@example.org with a picture/gif/video of the scene and an explanation as to why (should you want to include it).