An imitation of what they see

Lastborn: "If I was my Star Wars book, where would I be?"

This is the acceptable replacement for

"Mommy, Where is my Star Wars book?"

To which, he would hear,

"I don't know. I'm not responsible for your Stars Wars Book."

It's amazing how the things we say seem so trivial until we hear them out of the mouths of our kids, over and over again.