Strange Car Conversation

The other morning, we were all in the car together on our ways to school and work. The children were good-naturedly bickering in the back seat, but I, sensing the potential for the situation to escalate, intervened by using the sympathy appeal.

Me: Come on, you two. Settle down. You'll scare Flipper.
Andrew (without hesitation): I will scare Flipper until he hides in the bottom corner of your uterus!
Madeline: What's a uterus?
Malkhos: It's an upside-down Greek vase that Flipper is living in right now.