Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
One example: I've read this book with much expectation, it was very boring all through out the book
Solution is here: Negative
Explanation: Review writer does not like the book because it was boring, therefore it is a negative review.

Now, solve this: This book [stinks]. I read this book only, because I seen the preview for the movie. It jumps around from one thing to the next. John Keel is a nut, "the phone rang and nobody was there!" "That could only mean the time traveling space aliens, cause no human would be capable of calling my house and hanging up." "The CIA/FBI are out to get me" Please!!! Go see a shrink.
Solution:
Negative