http://now.msn.com/living/0502-restaurant-locks-up.aspx
supposedly this restaurant has a policy where they include a 17% gratuity to your bill if your party has over 5 people. this family didnt want to pay the tip because they thought the service was poor. apparently they were locked inside the restaurant, the cops showed up, they eventually paid the tip and left. i could make arguments for both sides here, but i lean to siding with the restaurant.