I have done this exactly once in my lifetime, two years ago. Maybe in another few decades, I’ll do it again, if I live long enough.
And yes, even if your name is Karen but you had a good reason to ask to speak to the manager, you can also reply
Yes. I went to a Burger King and ordered a burger. I sat there waiting for 15 minutes while the tray sat on the counter with my receipt with order number, fries, a cup, but no burger. Finally, I asked the blonde lady taking orders where is the burger so I can go to my seat.
Her response: “you ate it.” I was confused. I told her no burger was filled for the order and the tray had been there the whole time.
“No, you ate it.” Now, I wasn’t fat or even chubby, so it wasn’t some kind of fat phobic thing. I am a different skin color than her, though. I was confused what her problem with me was, but she kept insisting I ate the burger and wanted a free one. I was dressed business casual, with a white shirt and dark pants, so I doubt it was my clothing that made her think I wanted free food. I even showed her some cash and told her that if I wanted another burger I can buy one.
I finally asked to speak to the manager. He listened to my complaint. Made me fresh food and told her to shut up and get out of the way, pointing to the door while she protested out loud the whole time, throwing a fit.
I seriously don’t know what was wrong with her or why she was so insistent that I wanted free food. It was weird.