Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Very disappointed

I saw the monty hall puzzle in the movie 21, and I searched the web for the origin of that puzzle, I landed on this book. She has to be one the smartest person on the world, but she didn't have to show how stupid other people were. Ninty percent of the first chapter were "stupid" mails from her readers, probably she needed those mails to show how smart she was.