Straight from the horse's mouth

Watching "Ace of Cakes" with Peanut, who loves to cook:
Me: What do you think about those fancy cakes? Do you want to make cakes like that when you grow up?
Peanut: No.
Me: No? What do you want to be when you grow up?
Peanut: I don't know.
Me: Do you want to be a chef?
Peanut: No. Stop asking. I don't know what I want to be.
D: You don't need to know yet.
Me: You know what, I don't know what I want to be when I grow up.
Peanut: You already grew up.
Me: Well, that's a bummer, because I still don't know what I want to be.
Peanut: You're nothing. Dad has to go to work and you don't have a babysitter, so you're nothing.