""As my waitress ex-girlfriend said, a good tip and a good attitude from a customer ensures no spit or other bodily fluid in that customer's food.
Think about that the next time you decide to not tip a waitress at your regular restaurant.""
And if caught said restaurant will be out of business pronto. Not only that if the person has a communicable disease they face the possibility of criminal charges.
How often do you think people get caught for this type of behavior?