Some years ago, I agreed to write a short student-friendly monograph about a particular area of philosophy in which I work for a publisher that was planning a large series of such books. Well, I never really got around to writing the book and the series never really materialized anyway. Amusingly, the book was for years available for "pre-order" on Amazon.com. Roughly a year ago, it disappeared, and I forgot about it.
A few months ago, I was flipping through a few journals I don't read regularly, and found a citation to the non-existent book. The author included it in a "for further discussion, see...." footnote. Hilarious. This reminded me why I don't read that journal.
Now it has been brought to my attention that the book is once again listed on Amazon. However, it is now listed as available from a used dealer. The book, which was listed at roughly $20 when there was some reason to believe it was forthcoming, is for sale "used, like new" at $110!