It seemed very familiar to me too, but I couldn't remember what that meant... lol. One thing I am still puzzled over, though: where on the show does it say exactly that their anniversary is October 6?

Mulder: Imagine if you could come back and take out five people who had caused you to suffer. Who would they be?
Scully: I only get five?
Mulder: I remembered your birthday this year, didn't I, Scully?

(The X-Files)