She was visiting from D.C. in the first year we lived in our house, and she simply knocked on the door of our house randomly because she was in town for a Stanford University reunion and said she wanted to revisit her childhood home.
She could have been a complete nut job. But she said a few things about the house that only someone in there would know so we gave her a tour. She told us some really cool stories about the place that we had no idea about. And I just saw in the 1940 census info today: there she was. Guess she wasn't a complete mental case.