To add to the barebones story, I met Terry Prattchett during a book signing session. We had an exchange that could have been in one of his books.
TP: you look familiar. Have we met before?
Me: no, but you met my sister.
TP: does she look like you?
Me: not really.
That was a long time ago, and I am paraphrasing to an extent, but it stuck with me!