While pondering updating my references lists I decided to see if I couldn't track down one of my former coworkers. (The Princess, for those who remember five years or so ago.) I managed to find someone on LinkedIn who looked likely, so I dropped her a note yesterday.
I saw today that I had a note back from her saying "happy birthday". I was really impressed that she remembered when my birthday is -- until I (feeling like a goof) remembered that she and I share a birthday.