Pretend

Sam is cracking me up with his pretend play lately. He came home from visiting the nursery with Grandma on Friday, and while bobbing up and down, he said "look at me. I a plant. I growing!" Later that day, in the car, I hear "Look at me, I a crocodile." I turn to glance back at him in the car and he had his head back and his mouth as wide open as it would go. I had to laugh out loud at that one. Where does he get it from?!?