When I was younger I remember a neighbor telling me, "I can see your epidermis!" I had no clue what he was talking about and worried I was exposing myself until he finally explained.
So, I decided to tell Mary (my 8 yr old niece), "I can see your epidermis!" After she looked herself over and made sure everything was covered, I explained that epidermis was your skin. She decided to go tell PawPaw (my dad) her new 'joke'...
She ran up to him and said, "I can see your uterus!" He looked at me really confused and wide-eyed. I said, "No Mary-epidermis." She said, "Oh, then what's your uterus?" I said, "where a baby is in your belly." She laughed and said, "I must have heard you or my mom say that. I got confused." (Not sure that uterus is a topic of our conversations even if we were pregnant at the same time but whatever.)
A week or so later my sister called and asked if I had introduced epidermis into Mary's vocabulary. I said, "yes." She said, "Well, she told me she could see my uterus!"
Oops, maybe that wasn't such a good idea on my part. I can't imagine what her teacher thinks goes on in our family.