Waiter, what's this fly doing in my soup?

(The punchline is "backstroke" which is such a groaner)

What’s the worst thing that’s ever happened to you at a restaurant? Did you work at one and get treated like crap? Did you go on a terrible date? Did you nearly choke on your food? Get served a salad with a bug in it? You can come at this one from a lot of different ways, so if it is helpful, make a list of not-good restaurant moments, pick one to write about and store the rest in your master ideas file.