That's ridiculous! A tip is a gratuity which is defined as a reward, service, or payment provided freely, without obligation. If the service was so poor that they didn't want to pay a tip, then the manager was crazy to call the police over the issue, no matter what the menu said. Now there will be negative publicity over the bad service and the restaurant suing its own customers which will hurt his business much more than $16.35. Besides, they accepted the $73 as payment in full and then reneged on the deal and called the cops. The two young men should never have been arrested. I think it should have been strictly a civil matter, not a criminal one.