A non Jewish person visits a synagogue on Sukkot. He returns to his friends and says, " I don't know about those folks. I am not sure they know whats happening" His friends asked, why he would say that. He explained that the Rabbi had a shakey branch thing and shook it and said " I know" The non Jew went on and explained that the congregants responded by shaking their own branchy things and replying with " I know". Then, curiously the Rabbi shook that branch again, and this time he said " I dont know" and the congregants shook their branches and responded, " I dont know" The non Jew, went on... then the Rabbi put his branch in the air shook it and said, " How should I know?" To which the congregants answered, " How should I know?" The non Jew shook his head, I just dont know what they know or dont know!