It would probably be better without the narration -- the images and dialogue speak for themselves in this one.
I think the punchline could be stronger, too. Though a mother who spontaneously combusts (and doesn't die) whenever she gets angry would be a pretty funny character. "Billy, look what you made me do! You made me angry and now I've gone and melted my Hummels!"
On second thought, maybe that wouldn't be funny.
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...Trot and Cap'n Bill were free from anxiety and care. Button-Bright never worried about anything. The Scarecrow, not being able to sleep, looked out of the window and tried to count the stars.