Reader Ben Schewel shares this handy "Default Clause" just in case (author unknown):

12.7 END OF WORLD.  In the event that the world as known to mankind shall come to an end, whether through natural forces (including, without limitation, plague, drought, earthquakes, hurricanes, and floods), manmade forces (including, without limitation, nuclear or biological war, pollution and global warming), or divine forces (including, without limitation, the Second Coming, the Mayan Cataclysm, and the Rapture, regardless of religious affiliation of Bank or Borrower), then, in such event, all outstanding principal, interest, fees and charges remaining under the Loan Documents shall immediately become due and payable to Bank at Bank’s offices or designated shelter, without notice of any kind of character, all such notice being hereby waived by Borrower, and Borrower agrees that the end of the world shall not be deemed or construed to constitute a valid excuse or defense to payment; provided further, that in the event that the end of the world shall be divinely inspired, then, in such event, Borrower further agrees that Bank shall be aligned with forces of goodness and light, and Borrower shall be aligned with the forces of evil and darkness, and that Borrower shall be cast into a pit of fire until all sums owing under the Loan Documents, including attorney fees, shall be fully paid; provided further, that in the event that Borrower should be reincarnated subsequent to the end of the world, whether as an animal, vegetable or mineral, then, in such event, Bank shall have and possess, in addition to the collateral stated in the Loan Documents, a security interest in all of Borrower’s useful products, including, without limitation, any and all fur, hide, meat, edible portions, medicinal properties, and mineral rights, to further secure the prompt payment of all sums owing under the Loan Documents.