The Black Shirt Mistake
I was waiting inside a store for my friend when a woman walked up to me and asked where she could find a certain item.
I told her I didn’t work there, but she apologized and walked away. A few minutes later she came back and asked if I could check the back for her.
I had to explain again that I was just a customer. She looked at my shirt, then at the actual employees, and finally realized her mistake.
We both laughed about it and she apologized before walking away.