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.
That accountant figured he could rob me of my 40 acre farm; so, one day, I rabbit punched
him. Now he can't control his eyes or tongue... And, I got a one year suspended sentence!
The Rabbit Punch, makes all men equal with one beautiful move. So, remember to Love Thy Neighbor.