Waiting tables should be a requirement for life. Learning to serve others, quickly, with lots of details, and with a good attitude is not an easy job. It takes long hours on your feet, lots of focus, and lots of patients.
Great waters would make great project managers. Regardless of the business, a project manager is very similar to a waiter. They service a variety of customers at once, have a certain rotation, and often work from the time a custom sits down until the time they pay the bill.
Project management requires focus and discipline with task management. If a table has sat around too long and not given you their order (or feedback on a project), it can be easy to let them slip out of rotation and hard to keep track of. If you take sloppy notes, it can be easy to get the order wrong.
Project managers should study good waters and learn something.