Great list, forgot one.
When a horn on a car honks, it's because it's someone who knows you and is saying "Hey", not "Hey, Get the H#$@ out of the way"!
I had to teach my kids this when we went up North a couple of years ago. Sitting at a light and didn't get a .003 reaction time and had a young chicky chick lay on the horn, to which my kids said, "Dad, who is that girl who honked at you? Wow, someone from our town way up here!" That's when we had the Yankee talk
