A "Bone Punch" is classified as a punch exectued on the bone or joint rather than the muscle or fat tissue of an unaware victim.
Given the unanticipated opportunity to deliver a swift, hearty Bone Punch, it is necessary to first distract the victim's attention by shouting "BONE PUNCH" before striking the crippling blow.
It is also a lesser known fact that the Bone Punch is also open-ended, leaving room for the "Muscle Punch Compliment." Once again you must shout "BONE PUNCH with a Muscle Punch Compliment!" while executing the blow.
FACT: Bone Punches hurt so much more then regular punches.
Grandma is now on the ground, confused and partly unconscious.