Some things are best left alone

The damnedest thing happened tonight.
When Moonie and Felix, the little nob, got back from play practice they were skipping and singing
"I'm gonna wash that man right out of my hair
I'm gonna wash that man right out of my hair
I'm gonna wash that man right out of my hair
I'm gonna wash that man right out of my hair"
Over and over again.
When they saw me in the kitchen they both started laughing and ran up stairs together.
It's good that the two of them are getting along, but what do you make of that?