Etiquette
Minnflyer, have you seen his hat????
Actually for talking on the flightline, one good rule to follow was already covered here briefly; ask someone if they mind talking while flying. Some of our members like to be in a "zoned world" while they fly; others like to chat.
It's no big deal to ask in advance and most flyers will be honest in their preference. That is the best advice you can follow and your fellow flyers will probably appreciate that you asked. Good way to make some new friends and to see how they fly too.
Then afterwards, you can all sit back and laugh at the instructors hats.
Nuker