On the fridge.

Long before cell phones and text messages, sometimes we had to wait to tell someone something. If a family member was coming home when you would be out, you might write a message.
You probably would have used a magnet to hang this message on the fridge, knowing it would be seen when the recipient opened the door.
It would also be seen be everyone else.
Today I looked at my fridge and thought how lonely it looked.
I think I might write a note.