Not a hunting story, but one that I experienced working in a small packing plant run by some Vietnamese guys.
The plant was doing pigs that day and as was my duty I observed the guy doing the electric stunning. He stunned the little BBQ hog perfectly. Went down immediately, hung and bled it out properly, I watched the blood all drain as it should from the body, with absolutely ZERO sign of life or sensibility, and the worker hung the pig on the rail awaiting the scald tank.
As the worker was over stunning another batched of hogs, I looked up to see a commotion on the rail and saw the little BBQ hog wriggling around violently, which was out of character for how well the worker had stunned and bled the pig, and for the length of time it had been on the rail.
Next thing I know, the hog falls from the rail to the ground, about 12 feet, gets up and starts walking around as normal. The employee operating the stunner re-stunned the hog, and stuck the pig again and not a drop of blood flowed out of it. The employee even did a second bleed stick directly into the heart to make sure that it was properly bled and again, no blood flowed.
Once that all happened the employee started shouting in Vietnamese, and looking like he was ready to lose his mind. He then he threw the pig over the stun pen and told me "Devil pig, Devil pig! You Condemn!!"
Apparently they were a very superstitious bunch and believed that the pig had come back to life due to some kind of evil spirit and would not accept it as being fit for human consumption.
To this day I scratch my head thinking about that one because everything was done correctly and by the book and every action by the employee was done perfectly and there was not a drop of blood left in the pig that should have allowed it to be up and walking around after everything.