I plan on spending my final days like my normal days.
Once it's the 22nd of December, I shall sit. And laugh at the fools that really believed it. then complain about all the court cases of rape, looting, murder etc. caused by people certain that the world would end.
Don't forget the frighteningly probable possibility of either a population boom, or mass-abortion (mostly out of convenience (most common reason for other cases without the Apocalypse factored in; which thoroughly sickens me as a human being. To kill your own child before they have a chance to be born/live, because you don't want to take responsibility, or take care of another life (not even considering adoption as an option), and want to continue sleeping around/party/etc.? Pardon my strong moral code, but that's just cruel.)).
Worryingly, the latter, more than the former (considering all the morons that have to "get laid before the world ends" in "last night on Earth" scenarios). Such a waste of life; so many silent screams. Mayhaps that is what the prophets foretold of "Many Screams from Hell" or catastrophic amounts of loss of lives when the Apocalypse arrives, or something of the sort? Not the mature lives being eradicated, but the potential newcomers, upon mass-abortion, if they are factored in as the millions upon millions of lives lost.
Whether or not you believe life begins at conception, it still makes me sick thinking about it. That would be alot of pissed off spirits being denied right to contributing to a potential population boom.