When I read the title of the thread, I chuckled to myself, because I've been there... done that. 
I had this nasty new hampshire red rooster who I stomped good on his neck, twisted, swung him around, he hung there, limp - dead. 
I was sure his neck was broken - it was getting dark, and I didn't plan to eat him, so I put him down next to the barn so I could bury the carcass the next morning when I got done doing chores. 
Next morning I walk out to do chores, and the body is not there - I figured a coon got it and dragged it off.  I walk into the barn and there is that "dead" rooster, walking around trying to intimidate the cow - strutting just like nothing had ever happened to him.  His crow was pretty messed up, but he was alive and kicking. 
He didn't survive the second attempt at Offing him - I made sure the head was seperate from the body so no second chances. 
So yes, I have seen Zombie Chickens 
  they walk, they are are out there ---  beware!!!!  
meri