Instruct: Classify Amazon reviews into positive or negative sentiment
Query: on a rollercoaster

Reading this book was like riding on a rollercoaster. In fact, picture a bell-shaped curve. My interest paralleled his writing, i.e., very little at first, increasing a lot towards the middle of the book, and then really waning towards the end. The only reason I even finished this book was because I was about 3/4 finished when I felt that I was wasting my time. ...