that's silly

Just now at dinner Sarah asked me if I knew as much as Daddy. "No," I replied. Alan said, "Mommy knows more about some things and I know more about other things. Some things we both know. Like about stock car races." I said, "Yeah, we both know that a) it's stupid and" Alan finished with "b) there's nothing else to know." Sarah laughed and said, "You're silly mommy. "a" isn't stupid."