In a few hours it will be 12-21-12 which not only is a good day for craps, but it's also a good day for blackjack... if the world doesn't end.

You have 12s for the horn bet, the field bet and the craps bets, and of course boxcars straight up in craps.
And you have blackjack 21.
Plus mirror images of both.

And if the world does come to an end, you won't have to repay your markers 30 days later.