I love all the ritualized behaviour, secret meanings and unexpected taboos - standing up when someone of higher status stands, elaborate rules for serving and eating, tapping the table to thank the server, never refuse a toast from a superior, stuff like that.
Whether it’s about meals or anything else, I’d love to hear about any uncommon politeness standard or similar social behaviour that goes on in your location, culture or restaurant!
Because I’m neurotic, I always place items on the belt grouped in the order that I plan to bag them: first comes cold items, then pantry items, then hygiene & cleaning products, and lastly produce.
I routinely beat the checker :)