Look Who thinks he’s nobody!

One day a rabbi, in a frenzy of religious passion, rushed into the synagogue and fell to his knees before the prayer sanctuary. Beating his breast, he cried out, "I'm nobody!  I'm nobody!"

The cantor of the synagogue, impressed by this example of spiritual humility, joined the rabbi on his knees, shouting, "I'm nobody!  I'm nobody!"

The shamus (custodian) watching from the corner, couldn't restrain himself either.  He joined the other two on his knees, calling out, "I'm nobody!  I'm nobody!"

At which point the rabbi, nudging the cantor with his elbow, pointed at the custodian and said, "Look who thinks he's nobody!"