So it's during the "Shall We Dance" song. The woman is teaching him to dance and says the counting is "1-2-3-and". :-) I haven't seen it in forever, and I need to watch it again. Here's the scene if you're interested: https://www.youtube.com/watch?v=QgVPnWmUqd4
The part related to the meme starts at the 1:45 mark. :-)
Not an afficianado, but my mom loved that one when I was growing up, she always quoted the movie/play like she was a real-time memer, haha. Clean your room, etc etc. Eat you supper, etc etc. Do your homework, etc etc. Haha the list goes on!