From http://www.writingexcuses.com/2008/09/29/writing-excuses-episode-34-what-the-dark-knight-did-right/

I'm Brandon, I'm Dan, I'm Howard . . . and I'm Batman
( here there be spoilers? )
Writing prompt

Brandon: take an old piece of writing, one that you've been working on in the last year, and take a dialogue scene. Then take each line of dialogue up by half a notch -- make it a little more unexpected, evoke a little more of the character -- but it should mean the same thing.
Howard: crank it all up, but have the dialogue end up in the same place as before.