Sara: "Nanci, do you like witches?"
Nanci: Well Sara, I don't think I know any witches.
Nanci: When do you see witches?
Sara: At night. You know, they're nocturnal. Like bats.
[Long pause, while we process this newfound vocabulary]
Nanci: Sara, what does nocturnal mean?
Sara: You know, nocturnal - they sleep all day and play all night!
I have no idea.