A gentleman should never take his hat off with a flourish.
The only occasion when the traditions of courtesy permit a hostess to help herself before a woman guest is when she has reason to believe the food is poisoned.
Never say "Au revoir" unless you have been talking French, or are speaking to a French person.
No rule of etiquette is of less importance than which fork we use.
The joy of joys is the person of light but unmalicious humor.
Never take more than your share - whether of the road in driving your car, of chairs on a boat or seats on a train, or food at the table.