Tucking Kaylee in, Singing her to sleep, I ask her what song she wants me to sing next.

Kaylee: Pants song
Me: What's the pants song?
Kaylee: PANTS song!
Me: Can you sing it for me?
Kaylee: No
Me: Can you tell me more about it?
Kaylee (after thinking for a moment): Horsie, Flower, Pants, Snaps, Button. Pants song. KAYLEE pants song.