Instruct: Classify the given review into positive or negative sentiment.
Query: Stop watching after 20 minutes

The first 20 or 30 minutes of The Hitcher are really well done and genuinely frightening. After that it breaks down into a film of strung-together, ludicrous plot devices and nothing more. The film does nothing but turn your stomach for the remainder. Many people enjoy it, but I'd see it first before purchasing it.