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.