I wasn't sure where to put this, but decided in the end that, whilst being video-gamey, it's really more of a science and technology/sociology topic.
http://www.youtube.com/watch?v=7T9heta_qLI
So, they're flogging vault style underground shelters for use in the event of an apocalypse. Looks pretty homey, 'til you start picturing the flickering lights and the blood on the walls. Is it pessimistic of me to assume that being in such a situation could only end in a knife-fight with a crazed yuppie over the last can of dog food? Mind you, I'm not even sure why they'd have dog food, other than to clearly delineate the point where you've hit rock bottom...
Congratulations, Citizen! You have been approved for entrance into one of our patented Vault-Tec™ vaults!
(http://i154.photobucket.com/albums/s270/danieljwall/strangelove.gif)
Animals could be bred and slaughtered.
I can hear it now.
*Beep* This is Xerxes...
Or you could just fake an apocalypse and then make money by selling security footage as a reality TV show.