When I was three years old, I had every children's book in our house memorized.

My mom took me to a dentist appointment one day, and while we were in the waiting room I wandered over toward the book rack. I picked up a book and started reading it aloud. Mom thought nothing of it until one of the other people nudged her and exclaimed, "Your little girl is *reading*!" Mom started to explain about the memorization thing when it dawned on her that we didn't own that book.