Yes, it's the Favorite Older Sister's birthday today, or as we call it, her dirfday. It's a long story and particularly humiliating for Mojo, so she will not go into it.
But it's funny--I don't know why I thought of this, but I did so now the Favorite Older Sister will be just agog wondering how my brain put the two together, but here goes anyway. I was reminiscing about my many many years on the various incarnations of the internet--since 1988 or so--and back during the Usenet newsgroups heyday one group I used to just LOVE to read their faq was a group called alt.folklore.urban. They were a group of hardy souls who would try to research urban legends to see which were true and which weren't. Their faq was basically a list of every possible urban legend and the results of their research about that particular story.