Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Starts great and the falls very far behind

The way insidious started, it had the potential to become one of the scariest movies of all time. The first hour or so were confusing, with great setup and even better execution. The type of great scary movie where you know something scary is going to happen and are still scared out of your mind when it does! This was great. But then the movie went quickly downhill. The last part was some stupid, goofy bad movie which you wouldn't want to have anything to do with.How did this movie go so far off track? Did the director go home or the writer's get fired? It just went so bad so quickly. What a shame because it had such promise. Save your money and don't rent or buy this turkey.