You start with “fill up my cup” — which at this moment in the song reads as a cup of beer at a party or maybe even a cup (glass?) of champagne at a sophisticated nightclub. And then with just two words the song pulls aside the curtain and says — you are at a bar mitzvah. Look to your left — the man dancing there there is 75. Look to your right — the girl dancing there is 12. Look down at the cup — it’s a kiddush cup.