One of the things I clearly remember being taught as a child is manners. I was to call adults "sir" and "ma'am", and never call them by their first name unless I was invited to do so. When I needed to get the attention of my mother who was already engaged in a conversation, I was to (politely, never screaming) say "Excuse me" and then wait until I was addressed to speak.
And I was always, always, always to say "please" and "thank you."
I do this with my own kids now. We start practicing "please" and "thank you" early on, arguably before they know what it means (or can even properly say it. Although there is something to be said for the insane cuteness of a one year old's "tank too"). I'm a firm believer that being polite and gracious will get you so much farther in life than demanding, entitled behavior.