The polite thing would be to say to the noisy person, “I beg your pardon, but I can’t hear the music. I wonder if you would mind talking more softly?… - Judith Martin

Dear Miss Manners: What is the proper way to eat potato chips?
Gentle Reader: With a knife and fork. A fruit knife and an oyster fork, to be specific. Good heavens, what is the world coming to? Miss Manners does not mind explaining the finer points of gracious living, but she feels that anyone without the sense to pick up a potato chip and stuff it in their face should probably not be running around loose on the streets.

Miss Manners’ attitude is that it is better to bar the door to unwanted guests than to back them out through it.

Getting children to say ‘Please’ and ‘Thank you,’ directly and in writing, is one of the chief tasks of child-rearing. It is a simple matter, requiring about ten years of contant vigilance, but those who give up on it might as well — and generally do — concede failure on the entire enterprise of civilizing their young.