Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: BEST LOCK DOES NOT STAY TOGETHER

This birthday present for a 5 year old was a disaster. Even adults couldn't get this thing to stay attached. The whole thing fell apart 3 times trying to connect the final pieces. "this toy is a dud" said the 5 year old. It is getting sent back. Pay the money and get lego.