Jen Campbell's Weird Things Customers Say in Bookstores is "so funny. So sad . . . read it and sigh" (Neil Gaiman). A simple Twitter question posed by John Cleese--"What is your biggest pet peeve?"--inspired Jen Campbell to start a blog collecting all the ridiculous conversations overheard in her bookstore. "Did Beatrix Potter ever write a book about dinosaurs?" "Did Charles Dickens ever write anything fun?" "I've forgotten my...