If you’ve ever worked in the service industry then you’ll know that some customers are far from delightful, as plenty of waiters would love to tell you. But even the people who think they’re being exemplary patrons have a thing or two to learn.

Vice collected advice from waiters who explicitly stated how they’d like to be treated by customers. For example, Anne hates it when customers try to get her attention by screaming her name across the restaurant. Meanwhile, all that Lisa wants is a tiny bit of politeness, like saying ‘hello’ back to her when she introduced herself. Sam’s biggest pet peeve at work is hearing customers mutter comments about his tip if anything goes wrong. Sounds simple, doesn’t it? If only the two chads had the sense not to throw their weight around, their wallets might be a lot fuller than they were before.