Teaching Note Stem Direction : Poppin' P's and Down- Low D's

I was playing Simple Stems with 2 of my children to review note stem placement.  A few turns into the game after I had explained that notes look like p's or d's (They can paddle and dive but never bbq) my son was still making a few mistakes. My daughter excitedly exclaimed, "Hey, I know... Poppin' Ps and Down low d's."  She explained that all of the notes above the middle line look like ps, and popcorn pops up, and all of the the notes down low (below the middle line) look like ds.  This little analogy worked really well for both of them and they whizzed through the game after that.