I had to learn a whole slate of table manners when I was growing up. Among them were don’t slurp your milk, chew with your mouth shut, don’t talk while you’re eating, use your silverware not your fingers, do the two hand switcheroo with the knife and fork when cutting meat
(you then had to trade the knife and fork and eat off the fork),
ask to be excused at the end of the meal, and don’t drop food to the dog under the table! I put in this last one to reward anyone who finished the list. It was an actual rule, but I doubt that it was in Emily Post’s book of etiquette.
At camp I learned two new rules which were given special names or rhymes. The first went “Mabel, Mabel well and able get your elbow off the table.” This was new for me. And if you propped your knife on the side of your plate you were called out for making a “gangplank.” Not manner related but camp fun nonetheless, when a milk carton was empty we were to lay it on its side and announce “dead cow,” to get the servers’ attention.
With the exception of the knife and fork switcheroo, all these manners seem to be expected all over the United States. I am curious if any of my readers can add to my list.