OMFG

Maureen (coming down stairs): Did you know that penises and vaginas are the same thing? Penises and vaginas.

Dad: Well they aren't the same thing, boys have one and girls have the other.
(Note to the readers: He couldn't bear to repeat the words)

Maureen: That's right, I have a vagina and you have a penis. And your brothers have a penis. And your dad has a penis--a dead penis.