@EGK, Harriet's birthday is my mother's birthday,
Ah, awesome. Now what are the odds of that? (I mean...I know it's 1 in 365, or 1 in 366 if both persons are born in a leap year. Of course, there's also the odds of having one person born in a leap year and the other isn't, in which case you would have to take into account the probability of leapday birth, take the complementary chance of that, and then multiply it by 1 over 365...and then...wait, why am I still going at it like this?)
Also, my sign-up is complete!