His newest favorite thing is copying everything Natalie does. So she's taken to calling him a copycat. The very first time she called him this, his immediate, almost reflex-like response was, "Meow."
And of course, Natalie and I both fell to pieces in laughter.
Now, she calls him a copycat just to hear him say, "Meow." And he says, "Meow" just to bring down the house.
Works every time.