Until a couple years ago, I used a small paper day planner to keep track of my appointments, "to do" lists, phone numbers, and so on.
I called it my "brain" because it was what I used for remembering stuff. I kept it in my back pocket, so it had to be small.
"When it comes to brains," I would say, "the smaller the better!"
I sat on my brain for most of the day.
My brain expired every year and I had to swap it in for a new, empty one.
My brain cost $8, and it was worth every penny.
One day when Sienna was about 5 years old, she opened my little planner, looked through it, got a twinkle in her eye, and said, "I'm reading your mind!"