Curious thing happens when you get the chance to see these movies quietly and maybe is just because is from the same writer but maybe not. In batman begins the main criminal says;

Ra's al Ghul says : Gentlemen, time to spread the word. And the word is panic.

In the Dark Knight, the main criminal;

The Joker: Why don't we cut you up into little pieces and feed you to your pooches? Hmm? And then we'll see how loyal a hungry dog really is. It's not about money... it's about sending a message. Everything burns!

coincidence about criminals giving a message, or writer is preparing us for the next villain?