To me the "Zombie" apocalypse is what is going to happen when the tax/borrow and spend economy that our government has created leads us to another major Depression.
My grandparents went through the first Depression and actually lived pretty well. They grew their own food, had chickens, pigs, and a few cows. They were self-sufficient in many ways and what they could not make or buy due to lack of money, they would trade the chicken's eggs, a side of beef, or even their own labor.
They said that people would come to their farm and ask to do work for some food. They would give them some chores to do and then feed them well.
Can you imagine what the ones that believe in "Obama Money" such as the girl in this link
http://www.youtube.com/watch?v=_Ojd13kZlCA will do when Obama's stash drys up and they do not get a check?
Do you think many of them would be willing to clean a barn stall for a meal? Do you think they would come to your door nicely and ask nice?
I think that many with the attitude of the one in the recording would just join roving bands of thugs that would take what they needed to survive. They would take by force and kill anyone that resists.
So, if and when those "Zombie" Hoards show up, I intend to be prepared.