Disclaimer: The Dark Knight belongs to Christopher Nolan, and, quite frankly, he's welcome to it.

"That was just appalling," a sandy-haired youth muttered to his sister as the two of them disembarked from the riverboat.

"Well, of course," his sister replied. "It was the Joker, after all."

"That's not what I mean," said the boy. "I'm talking about what the people on our boat did. They insisted on looking at the situation from a moral or an emotional perspective, when all they had to do was calm down a little bit and they would have seen what a beautiful variation on the Prisoners' Dilemma it was. If both groups choose No, they both live; if one of them choose Yes and the other chooses No, the former lives and the latter dies; but if both of them choose Yes, the outcome is indeterminate depending on who presses the button first. What's the rational course of action in that situation? Nobody wanted to think about that."

"Because," said his sister impatiently, "it wasn't a rational-behavior model; it was a sick joke concocted by Gotham's leading irrationalist."

The boy sighed. "I know. That's the problem with the Joker: he comes up with these great scenarios, but they're vitiated by his anarchy obsession. It's infuriating."

"Well, maybe you'll have to go into crime yourself and show him how it's done," said the girl lightly.

The boy blinked. "You know, that's not a bad idea."

"What?"

"Sure," the boy continued, beginning to get excited. "Make myself a costume, issue a public challenge to Batman… of course, it'll probably cost a whole pile of money, but it'll be worth it to show the world that great criminals don't have to switch their brains off when they put their makeup on. Maybe if I built a giant Sudoku grid, and then trapped eighty-one children inside it…"

The girl rolled her eyes. "Oh, get real."

"You just wait and see, Jocelyn," said the boy. "Some day in the not-too-distant future, your little brother is going to be the most feared criminal in all of Gotham. And I'm going to do it with logic and reason, not just with mindless mania like Chuckles back there."

Jocelyn Nigma sighed. "Sure, Edward," she said. "Whatever you say."