“I wonder... What's in a book while it's closed... Because as soon as I open it, there's a whole story with people I don't know yet and all kinds of adventure and deeds and battles... All those things are somehow shut up in a book. But it's already there, that's the funny thing. I just wish I knew how it could be.”

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“That's the reason they're called lessons: because they lessen from day to day.”

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“Think of a computer program. Somewhere, there is one key instruction, and everything else is just functions calling themselves, or brackets billowing out endlessly through an infinite address space. What happens when the brackets collapse? Where's the final “END IF”? Is any of this making sense?”

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Here I try to maintain a list of book in-jokes: little jokes that most readers won't notice, hidden in otherwise serious books (for more about what "in-jokes" are, see at the end of the list).

I'll need your help: if you find any such in-jokes, let me know. Please include the word “injoke” in the subject.

The books are listed in no particular order.

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