Usually once you've worked in the service industry, you learn how to be a good customer. Oftentimes, you'll learn how to respect your server, clean up after yourself, and generally be a half-decent human being while you're enjoying food at a restaurant. You'd think that it would be a natural reflex to be polite to the person handling your food supply, but for the disrespectful types, tormenting your server is a prize-winning sport.