Non-sequitur

Isaac: I want to go to Bob's and buy stuff, Mom.
Me: Really. Do you have your money?
Isaac: Yeah. I have money.
Me: Where did you get it?
Isaac: From Vivian's penny bank.
Me: Oh. Why was it in Vivian's penny bank? Why not yours?
Isaac: Because I had money and I put it in Vivi's penny bank.
Me: What's wrong with your penny bank?
Isaac: I have quarters in there and money and decaf lattes.
Me: ??
Isaac: Yeah, decaf lattes. Can we go to Bob's?