Elbows are never put on the table while one is eating.
Bread is like dressed, hats and shoes - in other words, essential!
"Keep your hands to yourself!" might almost be put at the head of the first chapter of every book on etiquette.
Courtesy demands that you, when you are a guest, shall show neither annoyance nor disappointment--no matter what happens.
Never do anything that is unpleasant to others.
A gentleman should never take his hat off with a flourish.