Scene: The Caterpillar is singing something indecipherable while I'm working on the computer. I stop typing and ask:

"What are you singing?"

"Shhh! I'm singing a song for you."

"Oh. Sorry. Go on with your song."

*sings*
"I was sing-ing for Moooom.
And she messed up my sooooong.
For-eeeeev-eeerrrr!
And now it will neeeeev-eeer be the saaaaaaaaaammmme.
I wasn't even being meeeaaaan.
But she still meesssed up my soooooonnnnnng!
Mommmmmma is nooooooooot funnnnn--nneeeeeee."

Parenting comes with a lot of unexpected surprises. Like self-esteem issues.