Add to that the kosher/halal slaughter.
This idea that all humanity is 'above' base animal behavior is as ridiculous as stating that all animals lack behaviors that we may label as empathy.
Experiencing this horror, I decided there and then that I will not eat meat and fish again to satisfy my tastebuds. It has been years since I left eating meat and fish. But even now when I see non-vegetarian dishes(at home or other places) I have urge to eat non-veg. It is very difficult to leave eating non-veg; it is like addiction. But everytime I have that urge to eat non-veg, that scene from the meat shop plays in front of my eyes. It is very painful.
Another scene that I regularly see in my local area every morning is when cattles are transported in a truck to a near-by mass slaughter house. The trucks are enclosed from all sides with just a slit open for the cattles to look outside so that they do not panic in the metal enclosure. Looking at their eyes one can easily see that they are trying to understand where they are and what is happening. And everytime I see that I say to myself, these unsuspecting defenceless animals are going to face a gruesome death within an hour just to satisfy the appetite of some humans!
There is absolutely push/incentive to monitor and correct for failures in stunning. The stress response it entails in the animal makes for poor quality meat, or even inedible meat that would have to thrown out.
Also, stunning is followed by slaughtering and draining. There is no situation in industrial production in which an animal would be dismembered and skinned alive.
I would completely support requiring direct expert supervision of every single animal slaughtered. This is the norm at the smaller operations, but something like 80% of US cattle are slaughtered at giant Chinese owned factory stockyards.
We are clearly demons.
And all those grand pianos falling over the poor cat again and again...
Oh sorry, we were talking about the real life, or in terms of a cartoon possibility?