I can't believe he hasn't thought of this yet. I mean, it would fit right on his utility belt. He is the Dark Knight yet he has no sword - WTF is that? I think a lightsaber (probably a dark blue - or pansy yellow to match the suit) would be a perfect fit for him. He would be the baddest MF around. The bad guys would be like "Who are you?" and he could say "I'm Batman BIATCH!" and slice him in half. Crime rates would have to drop, don't you think?