dueling what?

So the other day my wife was pumping so that I can share in feeding our kid. The pump she has is a fancy electric one with a dualie setup, so she can pump both at the same time. So Xander is in his rain forest chair and Amanda is pumping and she says "Gee, I wonder which one's going to fill up first?"

So how do I respond to this? Do I complement her shoes? Do I tell her she looks beautiful? Do I tell her that her hair is nice today? Nope, none of the above.

I, being the considerate thoughtful husband, go to youtube and played this for her.