One of my sister Natalie's first jobs when she lived here in Michigan was as a waitress at a local restaurant. I don't think she'd ever been a waitress before and she had a hard time at the beginning. One of the main reasons she had trouble working there was because she was a vegetarian and wasn't familiar with what certain things were on the menu and had a hard time describing them or recommending what was good. When a guest complained about her because he ordered Mahi Mahi and she asked how he wanted that cooked she got put on probation (I think) and she came home with the menu and had to memorize it and pass a quiz by her manager in order to keep her job.
Anyway, tonight Todd and I went out to eat and I ordered the black bean burger and the waitress asked me how I wanted the burger cooked? I guess I was kind of surprised, I said, "it's a bean burger, not a real burger." She said, "oh, sorry, I'm new here."
I couldn't help but think of Natalie when that happened, and I thought she'd get a kick out of knowing that she isn't the only one who isn't cut out for waitressing. Of course I didn't find it offensive like the man Natalie served, I just thought it was funny.