The following is an actual conversation I heard this weekend between an Orthodox rabbi's 5-year-old son and one of the congregants:

BOY: Do you have any kids? MAN: That depends on whether you mean the two-footed kind or the four-footed kind. BOY: What? MAN: I have two dogs. BOY: A boy and a girl? MAN: Yes, one boy and one girl. BOY: What are their names? MAN: Sophie and Jack. BOY: Are they big? MAN: Jack's bigger than Sophie.  Not that all girl dogs are smaller than boy dogs. BOY: Do you have a wife? MAN: No, I don't. BOY: Does anyone else stay at your house? MAN: The dogs live there. BOY: Do girls sleep over at your house? At this point I couldn't help myself from breaking into uncontrollable laughter.  When told what the boy had said, both of his parents were shocked and a bit embarrassed.  One leading theory is that the boy overheard a discussion about people needing to stay at someone's house.  Another theory is that he's beginning to figure out that not everyone has a family like he does.  All I know is that the next day he questioned someone else in a similar manner and wanted to know where one could find a wife.