Rabbit Punch

Any blow to the back of the head, -preferably between the skull and first vertebrae, shaking the victim's brain and upper spinal cord equally, -in particular the Medulla Oblongata, or brain stem, -which does not regenerate-, permanently disabling basic motor and bodily functions, as well as possible brain and nerve damage to lobes of the brain dealing with sight, smell, taste, kidney function, hearing, and respiration. By far, the most profound way to get even with someone, short of murder; on account it is: 1) easy to pull off, as the victim never sees anything coming, as well as, 2) deliberately aiming for that most tender spot in vertebrates, rendering it "unsportsmanlike", in athletic endeavor.