So thank you Google. http://m.wikihow.com/Hypnotize-a-Chicken apparently it's hypnotizing chickens. And it causes stress.
This is not meant to scold anyone...
Please do not do this to your chickens or any other poultry, because of the way their lungs are in their rib cages, when put in an upside down position and flat on their backs, it puts pressure on the lungs, they can not get the needed oxygen,. I am not sure if they are hypnotized or passed out from lack of oxygen