Apple Monster

I was toweling Violet off after her bath and she told me, matter of factly, "I'm a monster."

"Oh, really?  What kind of monster are you?" I asked.

"I'm an apple monster," she said.

"An apple monster?  What does an apple monster do?"

In a raspy threatening voice she told a word that I took to be "store."

"An apple monster stores?"  I asked.  "What does an apple monster store?"

"No, I 'stroy," she rasped.

"Ah, you 'stroy, like destroy?"

She nodded from underneath her yellow duckie towel hood.  "'Stroy.  I 'stroy the light.  I 'stroy the walls.  'Stroy!"

And just a quick as she was a monster, regular Violet came back.  I gave her a new pair of underpants to put on and she said, "Oooh, Elmo squares."

I want to know where she picked up a word like destroy, to use in exactly the right context with monsters.  Was there a destruction episode of Elmo's World last week?