Yesterday I was in the kitchen and the boys were playing in the library/playroom, which used to be a formal dining room so it is right next to the kitchen. I was listening to them and this is what I heard:
Ben: I not Mickey; you Mickey!
Nick: I not Mickey; you Mickey!
Me: laughing, as they went back to playing whatever they had been playing.
I have heard Nick do that a couple of times now. I don't know where he got "Mickey" from, unless it is from Mickey Mouse, of whom he has seen very very little to date. I guess he has figured out that it works to get Ben's attention when Ben is ignoring him.