The hidden easter egg in "Halting State" is that at no point does the book use the words "computer" or "software". Despite it being a book engaging with the social consequences of distributed computing and virtual reality.
(I do this sort of thing as a discipline, to focus my writing. The reason for the second-person voice in "Halting State" should be obvious to anyone who has even briefly played an adventure game: the second person is the natural voice of that particular game genre. Deliberately not using those particular words forced me to bear in mind that I was writing about people in a near-present where those particular signifiers have been so seamlessly absorbed into our culture that we don't think about them. Any more than we think about catching a train in terms of the procedural aspects of driving a train.)