The weirdest experience I had was a local burger joint I walked into that was completely empty with nobody eating there and nobody working at the counter and it didn't help that the decor was completely "blacked out". My first impression was that it wasn't open but I placed my order on a (ordinary sized) tablet and got my food and the people who came out to serve it were really nice.

The other day I was at McD's and an elderly lady was stressin' it because she had no idea what to do. There were two cash registers but nobody staffing them and a disorganized group of people waiting for their food and not even a clear queue for the people behind the counter to see that somebody was waiting. She asked me what to do and I told her she could order at the register but a minute later I realized I was standing in front of the register waiting for my food and that probably the workers wouldn't see her. I stepped out of the way and made sure she was highly visible at the register and when I got my food I told the worker that this woman was waiting for her food and she seemed quite annoyed but I didn't feel I could take it for granted they were paying attention.