Over the Rainbow

I was taking Lillie to preschool yesterday and the movie Wizard of Oz was on in the car. We had just picked up Lillie's little friend Laynee and Dorothy was singing "Over the Rainbow".
Laynee turns to Lillie and out of the blue says super sassy, "She is totally lip singing."

Lillie says, "What's lip singing?"

I was laughing so hard. It was such a random thing to hear out of a 5 year olds mouth.