I have some pretty strange conversations with my kids. Here's one I had yesterday with my eight-year-old son:
"Mama, could I see anything when I was in your stomach?"
"Well Bubba, first of all, you weren't in my stomach, because if you were, the acid in my stomach would have destroyed you."
Bubba nodded. "And then I would've come out as poop."
"Um, yeah. Something like that."
I continued. "You were in my uterus, and I really don't know if you could see anything."
"But what about the belly button?"
I looked at my kid funny. "What about it?"
"Isn't that like a little window? Couldn't I see out the belly button?"
"Bubba, seriously? Have you looked at your belly button lately? There's no possible way you can see in or out of your body through your belly button!"
He grinned. "But your belly button is special. It's a Mama belly button!"