Why is This Night Different from All Other Nights?

Earlier this week, in countless Jewish homes, at countless Seders, the youngest son, or, if there was no son, the youngest daughter, (not counting babies, of course!) asked the traditional Four Questions, beginning
"Why is this night different from all other nights?"

(In my family, I was the one who asked those Questions.)

And now, for me, as a Jewish convert to Catholicism, these words have an even deeper meaning as a foreshadowing of the night of the Last Supper... the night on which Our Lord instituted the Eucharist.