You Can See My Brain!

Tonight when Anna and I got out of the pool she and I were lounging in the Air Chair that we have under the deck.  She was facing me and we asking each other what different things were.  I started asking her about the parts of the face and I asked her where my ear was. She pointed to it and I then asked her what was in my ear.  I was referring to my earring which is usually something she points out immediately to me and asks me to take off so she can look at them.  Anyway, when I asked her what was in my ear she answered "Brain".  I said, "You can see my  brain in my ear?".  She said very seriously, "Yes." 
I laughed and started to try to figure out where she got that from.  Later it hit me.  We read a book where a little bear goes to the doctor and it goes through the whole exam.  At one point the doctor looks in the bear's ear and I always jokingly tell her he is looking at his brain. 
Oh well, at least she didn't tell me she could see straight through to my other ear!