I’ve never carried trays for a living, but I’ve always been intrigued by the people who do. Serving tables isn’t only about balancing entrées and drink refills—it’s about navigating a never-ending parade of human moods. A server meets everyone: the friendly, the frazzled, the demanding, and the downright oblivious. Watch them for a shift or two, and you’ll see it’s less a job than a master class in patience, empathy, and quick thinking.

Here’s a look at the most common customer types—and why a little thoughtfulness can make all the difference for the person taking your order.