"Mommy, can you turn me into a dog?"
"Um, no Luke, I can't. Why would you want to be a dog anyway?"
"Because you can tell me to 'roll over, Luke,' and then I'll roll over!"
"You don't have to be a dog for me to tell you that, I can tell right now and you can roll over for me, 'roll over, Luke, roll over.' You can't be a dog, you're already a little boy."
"I don't want to be a little boy. It's too hard."
And at this point I'm not sure that either Luke or a dog would follow my commands, be it 'roll over' or not.