Rabbi Jack receives a letter from the Royal Court that he going to be knighted. All his friends and relatives are so proud of him, but the rabbi is concerned. "How can I be a knight? A rabbi knight, who can conceive of such a thing? And besides, I'll have to go through the whole knighting ceremony. I'll probably do it all wrong. What do I do?"
His friends try to rest him assured. "It is really simple, you kneel before the Queen, she will announce you to be Sir Jack from now on and that's it. It's easy - don't worry. And you will continue to be the same old Jack."
That sort of calms the Rabbi down, but then he finds out that every knight has to choose a motto. Some line in Latin that he has to utter when the Queen knights him. This upsets him even more. "Latin! I do not know the simplest thing in Latin. Why must it be Latin? Couldn't it be Hebrew." In order to get rid of the whining his friends agree: "Yes, choose a line in Hebrew, that will be fine."
"Good," the rabbi acclaims, "I will think of something."
And so the evening comes round that together with a whole lot of other people, Rabbi Jack is going to be knighted. Each man kneels in front of the Queen, she announces their knighthood, they say their line in Latin and the affair is done.
Rabbi Jack is the last in line. He approaches the Queen and she proclaims: "Henceforth, you will be Sir Jack." And Jack says: "Ma Nishtana."
The Queen frowns, failing to recognize his motto, leans over to her adviser and whispers:
"Why is this knight different from others??"