Old women disguised as apple sellers should be avoided at all costs and they themselves should be aware they've been rumbled. Never ever eat a bright, shiny apple that stands out from the rest in the basket. It's almost certainly been poisoned.
I have no idea what Twinkle Twinkle Little Star is really about as, in my experience, stars tend to "twinkle" perfectly well by themselves and don't need exhortations from me to do so.