For some reason people believe in stocking up on guns for the end of the world; but don't prepare for the only thing that could wreck western society; a nuclear war
How do you prepare for a nuclear war? Dig an underground bunker, stock it with tons of supplies, and plan to live underground for a couple of decades? I'm not entirely sure I'd want to live through the aftermath of a nuclear war anyway. I highly doubt hunkering down for decades would be as fun as it's presented to be in "Blast From The Past".
Unlike gold and silver and other useless things that some people stock up on, firearms and ammo have very good uses - food procurement, self defense, bartering and trading to name a few.
(spoiler alert there is no such thing as zombies).
If you are prepared for zombies, you are prepared for a lot of what would happen in a non-pretend scenario too. So talk about zombies and have tongue-in-cheek fun with that, but you're actually preparing for real problems at the same time.
If you read Max Brooks book "The Zombie Survival Guide", you will often times find yourself immersed in basic survival strategies and totally forget that the premise of the book is a zombie apocalypse. It's an entertaining and fun read, and believe it or not, you can actually learn some useful stuff from it.