This made me giggle today:
Maya: You want to play cat and dog?
Me: Sure. How do you play?
Maya: You be the cat. I be the dog.
And for the next five minutes or so, we crawled around the floor, me meowing and Maya barking. Every so often, she'd stop and pet me.
"You a good kitty," she'd say. "Now, say I a good doggy."
Me: You are a good doggy.