A couple of days ago I went to the library book sale. I left the tote full of books on the sofa.
This morning I heard the melodious sounds of a cat hurking a hairball. I didn't put 2 and 2 together because I didn't see any evidence for it (my male cat Max can hurk and have nothing else happen, so I figured it was him and one of those episodes.)
Later on I got the idea that I should move the bag of books, since his favorite place to lay is right on the end of the back of the sofa, and the bag of books was in prime hurking range.
Too late (you all know where this is going, don't you?) As I took the books out of the tote I discovered that Max had managed to leave a largish hairball right on the cover of Early Asimov. Cleaned it off, then decided the cover was beyond saving. Fortunately the book itself was unharmed.