My father always told my sisters & I to klick a guy "you know where"! The course I took said never to do that because it makes them angrier. We were taught to hold our hand up in front of us & look for the letter L. (from the tip of the thumb to the tip of the index finger. If someone tries to attack you---what their windpipe wirh the L of your hand! It'll give you long enough to run by the time they catch their breath. Makes sense to me!