The last time that I went to have my hair cut and dyed I was chatting, as you do, and she said something that her (very clever 6 year old) daughter had said.
There was a misunderstanding about the nature of growing up, and someone made a comment about girls growing up and becoming men.
It was explained that girls grow into women, and boys grow into men.
After giving it some though my friends daughter asked 'And Stacy then?'
I couldn't help but laugh at that - perfect use of logic!
(It was explained that I had always felt like a girl, and so I was still a girl that grew into a woman - but I still love the logic of the comment)