This is what I imagined. It would probably be a bit smaller, but I think they can be more than just this size. I assume you carve them with some form of writing; etching, ink, who knows.
I wasn't sure whether I needed to do a pre-post to fix up all the attacks suddenly happening, so I decided to put it on the pad, and move it over if necessary. We made sure there was place for people to put their reactions etc. It wasn't like we were officially starting, just getting some writing down.
I'd like to reserve the Joker. Although crime would be necessary. "Dead? *laughs* I don't want you dead! I'd have to go back to ripping off mobsters. You. Complete. Me." Quote from The Dark Knight.