Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not what I expected

I am very disappointed with this book :( I bought it for my 5yr son so I could help him learn some funny knock knock jokes. I thought I was buying a book FULL of fun knock knock jokes, but when it arrived and we first opened it.....we found a little book that looks like it's made for a 2yr old (has VERY babyish pictures and thick cardboard pages)!!! The biggest let down is that is only has TEN knock knock jokes!! Unbelievable. ... I'll just have to suck it up and search for a new knock knock book...