heard in the hallway

The goob was cleaning his room (which actually means playing quietly in there until somebody notices there's no cleaning going on). Hubby peeked his head around the doorway to see how it was going. The goob was playing with little Lego guys who were having the following conversation.

Voice one: "Come on! Let's get into your Batmobile!"
Voice two: "But I don't have one."
Voice one: "What? Well, what kind of vehicle do you have?"