Newsflash: Being a server is really hard work. Despite being perpetually underpaid and underappreciated, being a waiter is no easy gig. If you've worked in the service industry, you know how it goes, and if you've never worked in the service industry, then you have no idea what that pressure feels like.
However, no matter what your previous job history looks like, I'm sure we can all agree that pranking a server is never a good idea.