I used to be a waitress at a seaside restaurant and had a few of those moments. A woman I once served asked for her clam chowder without clams. I told her that the chowder was pre-made and couldn’t be served without clams; she told me to get a strainer. Ok, sure. I brought her the chowder and she immediately called me over, “Where are the potatoes? And celery? On the menu it says...” I reminded her that she requested for me to use a strainer, she laughed at me and told me try again, and this time to listen to her and just pick out the clams. Afterwards she called my boss over and warned him about how slow I am, that I’ll never make it through the summer (this was my 3rd summer there). Turns out she summered in that town, and she continued to come to the restaurant on a weekly basis. She always requested me, always talked down to me, and always requested the clam-less clam chowder reminding me “just take out the clams! I want everything else!”. At the end of the summer she commented on how far I’d come since she first met me. Anyway, tip your servers >20%.