His new favorite thing to say, I'm never, Your never, We're never....this can accompany many different endings. If you find you cant think of anymore, don't worry he'll come up with something. Some examples
I'm never going to play with you.
I'm never going to share with you.
You're never going to get this.
I never want to see you again.
We're never going to be nice to you.
I'm never going to do what you say.
It goes on and on. He can even rattle them off all at once too. Then he walks down stairs, turns around and comes back immediately and asks for a treat, tells me that he loves everyone in the whole wide world. And that is how the day goes my friends.