From my various progeny:

21-year old son: (after a pause) So…when he graduates from high school, I’ll be…40?

12-year old daughter (in tears) It might be mentally retarded because you’re so old!

18-year old son: Okay. Cool.

almost 3-year old son: Let’s get a girl (gir-gul) baby for Katie (Kay), a boy baby for me and Daddy and another one for you!

Uh…no.