[svandamme]

If ya punch their lights out, they might bump their head on the way down, and have loss of memory.

Kidneys, they stay awake to feel the pain, and during that painfull episode you just stand around, make em look at ya and talk to them..
The week of pain that follows will just etch that memory in their mind forever...
Afterwards you can even make em cringe by hearing your voice over the phone...

It's not hitting them from the back if you stand to the side of them and apply with a right hook.