I love the conversations that I have with Jack (4) in the car when it's just the two of us. We have had some truly great ones.
Here is how one went recently:
Jack: Mom, bald people can't drive cars.
Me: Oh really? Why not?
Jack: (a sigh that surely included an eye-roll which I couldn't see) Because they can't see! They would crash!
Me: Oh, I think you mean BLIND people.
Jack: What does "blind" mean?
Me: It means you can't see.
Jack: Oh. What does "bald" mean?
Me: It means you don't have any hair on your head.
Jack: (incredulously) What??? (pause) Oh. (pause) So, can bald people drive cars?
Jack: So, what do you call it when you can't see?
Jack: Oh yeah. Blind.
Jack: Well, when a blind man goes to work he goes with a dog. The dog knows where to go.
Me: Yes, that's right.
Jack: But then he doesn't know where he his home is so he has to stay home.
Me: Hm. (huh?)