Booksellers Who Give Away the End of the Book Should be Shot!!

At the last meeting of my local book club, one of our members suggested that we read The Room by Emma Donoghue. After perusing the back of the book, we unanimously voted it in. However, it was the story behind the purchase of this book that has stayed with me since. Rhonda, the woman who bought the book, was appalled at the behaviour of the local bookstore owner who sold it to her. Turns out that the bookstore owner actually told her how the book ended as she was buying it. Call me crazy, but I thought this was bookseller 101 stuff - never tell the customer how the book ends unless they actually ask you to. Apparently not! Rhonda still read the book, and still enjoyed it for that matter, but it got me thinking - how often does this happen? Personally, I can't think of anything more frustrating, but I'd love to hear about any similar experiences you might have had.