My favourite Pho restaurant near my old office used to just wave and bring my #10 Large to my table when I went in (which was about 3x/week for 5 years).
After I left that job and moved out of the neighbourhood I didn’t go in for probably 10 years. Last summer I went there with my kid and as far as I can tell the place has been preserved in a time capsule. I walked in, the same waitress greeted me and waved at my usual table, and asked if I wanted my usual. I almost wept.
In fairness, I honestly don’t know why they have anything else on the menu, the #10 is amazing. Maybe everyone orders it.