You personal rival/enemy wants to make good with you. You both agree that you can take a free shot a him to even the score between you two.
You can either:
A. Slap him in the face with an open hand as hard as you like.
Or...
B. Kick him in the nuts. But you can't wind up. Foot has to start from the floor in a normal standing postion.
Which one would you chose?
Face would probably be less painful, but would most likely leave a mark for awhile. Hmmm... choices, choces.