Normally, just the sound of my voiced coming across as ticked is more than enough to prevent trouble from becoming more than what it already is, but as has been stated by more than one parent/person, sometimes you do have to make it understood that you will go farther than just using your voice, if needed. My son that I smacked is going on 15, and is starting to pick up some distasteful habits/tendencies from other kids, including the normal teenager attitude/mouth. Now, if you have never had to lay a hand on your kids, good for you, your cookie is at the store. The rest of us don't have the perfect little angel, and are mostly happy with reality kids instead of the flippin' Brady bunch/ Archie comics' kids.