Bacon, cheese slices and sawblades...

"Every so often, a journalist discovers that people use very odd things for bookmarks and librarians and booksellers find them.  Here's the latest one. 
"What is the cheesiest book you’ve ever read? For Washington DC librarian Anna Holmes, it wasn’t so much the book, as the slice of Kraft American that she found inside it, clearly used by a cheese-loving patron as a bookmark. "