"When It All Goes Down"

I think I mentioned a few months back that my Long Island friends and I have a little running joke. When we want to buy outdoor sports stuff, we justify it by saying it will come in handy "when it all goes down" - a reference to the next big terrorist attack. For instance, if you wanted to buy a new hunting rifle and your girlfriend asks you "Why would you want to spend money on that?" you would answer "It might come in handy when it all goes down."

This is sort of a running joke, but lately, it's become halfway serious. Craig just bought a 31' camper, ostensibly to take the family on camping vacations, but it also could come in handy when it all goes down. I wonder if I could use this excuse to get permission to dig a bomb shelter in my back yard...