Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Simple, realistic and frightening

This movie is flat out scary. Similar to "Open Water", in it's no nonsense delivery, this will give you a constant uneasy feeling throughout it's only 90 minute running time. This is not corny horror by any stretch. Everything that happens appears somewhat believable, and you are forced to imagine yourself in a similar predicament. If you enjoy Disney happy endings with sunshine and lollypops, this is not for you. If you enjoy gritty, realistic, brutal nature...this is a must watch.