Update:

The message board detectives are predicting that the message is, “The only sensible way to live in this world is without rules.”

What do you think?

And there’s a photograph or something under there.

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The Joker’s jack o’lantern is gone, and today a new, multi-city scavenger hunt has appeared in its place!Head on over to The Joker’s Why So Serious? headquarters and see for yourself.

But watch your back.

There’s more info here, and you can can follow the action right here!

(Thanks to Jett and the good folks over at Batman on Film for working so hard to crack the latest batch of puzzles.)

Stay tuned for the big reveal!