A zombie apocalypse is more like a 'placeholder' for any type of disaster that involves large scale breakdowns of infrastructure, worldwide pandemic, breakdown of social structures etc. One that happens to inspire movie makers and popular culture, as well. That's all, really.
Bottom line: if you're prepared for a zombie apocalypse, then (for the most part) you'll be prepared for many of those other possible disasters.
FWIW: the possibility of a zombie apocalypse isn't zero, it is just one of many disasters that
could happen (in theory). Of course the physics as shown in popular TV shows / movies like The Walking Dead, doesn't add up. But who cares - it's TV after all. :laughing:
Personally I think the most silly thing about a zombie apocalypse, is that I don't own a double-barreled shotgun to put to use in the rare chance that one
were to occur.
Or a razor sharp Japanese sword, for that matter.