1.   An unhappy, bickering couple who, at least in public, observe all the amenities of polite behavior.

2.   Group instruction is an inexpensive way to teach your pet the basics of polite behavior.

3.   One thing that most newcomers notice, almost immediately, is that there is a different set of rules for polite behavior on the Internet.

4.   Polite behavior in desperate circumstances.

5.   They were required to observe reasonable rules of polite behavior.

6.   When we are not thanking him for a modicum of polite behavior, we are waiting nervously for the next outburst.