Just a few signs of a good manners that make life more pleasant for all of us (not in any order of priority):

A cheery “Sorry!” if you cut someone up in traffic.
An apology when you are are late for a concert and cause a commotion.
Saying “thank you” for a dinner or party.
Saying “please” when you want someone to do something for you.
Saying “thank you” when a door is held open for you.
Patiently waiting in line and not queue barging.
Avoiding coughing over people in a crowded room.
Playing music softly on your i-pod, not at full volume.
Talking softly on your phone in a crowded train.
Offering a seat on a train to elderly folk who are standing.
Avoiding forcing other people to step into the road to avoid you on a sidewalk.
Asking permission to address a person old enough to be your grandfather by his first name.

Epicureans are careful to be courteous, sensitive and thoughtful in their dealings with both friends and strangers. Selfishness and lack of consideration for others is a sign of the brutish and anti-social. This is a crowded planet and we have to rub along together in cooperation. Manners are the lubricant that help make life pleasant, get the best out of others, and distinguish decent, thoughtful humans from wild beasts. They are the outward sign of empathy, not some old-fashioned set of rules which the impatient can set aside. They are as old as the human race, with good reason.