Here's a Tip

Here's a pearl of wisdom for anyone that finds themselves employed as wait staff:

Not only has no one ever won an argument with a customer. In the history of restaurants, an argument with a customer has never resulted in a larger tip.

You'd think that would be pretty easy to understand, but people miss this one all the time. Even when the customer is wrong, they're right. If you're going to argue with your customers, you may as well kick them out the door right then, because you've lost them as a customer.