A horn is a MUST! It goes like this: You beep the horn, and wave as you shout, "Howdy, neighbor". They reply, "Happy harvest!" (No, I haven't lost my mind entirely. See the Judy Garland movie Summer Stock. )
I don't have a BX, but I once honked a horn to signal to the lovely Mrs_Bob run into the house, grab me a cold beer, and then bring it out to me. Let's just say, I will never use the horn again.