I had this conversation with Noah the other day...
Noah: Je pense trop aux choses. (I think about things too much.)
Me: Oh? What do you think about?
Noah: Comment fabriquer des avions. (How to make airplanes.)
Me: Oh?? You think about that??
Noah: J'y pense plus maintenant. (I don't think about it anymore.)
Me: Why not?
Noah: C'est interdit à l'école. (It's not allowed at school.)
Oh.... guess we are not talking 747s here.