My little ha’ara about saying Good Shabbas….
Did you ever notice that when Yidden that do NOT know each other, pass each other on the street on Shabbas, they’ll say “Good Shabbas”.
But…
When you pass a Yid you DO know, but not really well (and you really have nothing to say to them) you’ll say “Good Shabbas, Good Shabbas” – i.e. you’ll say it twice, as if the second Good Shabbas is an acknowledgement of knowing the person, and is in place of really saying anything more substantial.