Batman: The Animated Series was so great. Not the best video ever, but considering it's a cartoon from nearly a decade ago, it's flat impressive.
Without any further ado, BlockoVision's The Dark Knight trailer presented in a TAS format.
Edit: You can tell that there was a rather drastic change in animation - the Joker's face is a little more round and even gentler, and the ears on Batman's cowl are a little longer. This was about the time (1997) they introduced the new Robin and the series was called The New Batman Adventures and they used a few different styles, none of which held a candle to the original. There were a few major changes between the '95 end of TAS and the start of TNBA which are hard to track down. I stopped watching around that time (I was living in Germany and TAS was the only version broadcast), so I'm a little lacking in trivia, though my friend James might be able to offer a better explanation. Am I rambling? Yeah. But it's just because I miss TAS so much.