Watch this couple freak out as the fish they're about to eat comes back to life.

Is his head moving when he does that? hahahaha

Higher order functions are planned out up in the brain, but most reflex signals haven't even reach the brain before our muscles have reacted. This fish has an intact spinal cord and hasn't been dead long so the signal pathways to the muscles are also still intact. So she's quite right, even without his head he is trying to protect himself from her knife!

A chicken lived for over a year after decapitation, because enough spinal cord was left to preserve life sustaining reflexes like breathing! https://en.m.wikipedia.org/...

This phenomenon is funny in fish and chickens, but really scary for families of people who are brain dead. They often retain many basic reflexes that mimic life. It can be very hard to conceptualise what is "life" and "death" when presented with someone who still moves and responds.