It's self-effacing, it's hard-luck, the shtetl stories. All those Coasters things are an amalgam of Yiddish and black humor.
And when I go around and talk to schools, what I tell the kids are, first of all, you have to accept each other's differences. Some of you are going to be a crappy football player, some of you are going to be a great mathematician. Whatever it is, accept each other's differences and help prop each o