Gratuity is a form of appreciation for good service that is only seen in civilized countries like America. A well-tended-to patron with good manners will leave an additional sum to reflect their appreciation for good service. This “tip” is usually between 15-30% of the total bill.
However, tipping a suspected masturbator is a completely different situation. You do not know if your waiter has included his seed in your meal and he probably does not wash his hands. In an extreme situation, your waiter might also have The Gay.
The acceptable method for dealing with a suspected masturbator that might be bringing your food, is to deduct the tip from the total amount. Twenty percent (20%) is the standard amount you should deduct; however, if the service was exceptional, you should deduct thirty percent (30%).