I love this line out of MadMen. "He's a little kid," Don replies. "My father beat the hell out of me. All it did was make me fantasize about the day I could murder him."
Bigmouth, my child from the age of 2 knew not to run on the road. I explained to him that he could get run over, and there would be blood and it would hurt. He had seen a dead mouse at that time and understood that it was dead, so I said if he goes on the road he could end up like that mouse. My friends beats her child every time he runs on the road, and at 4 he still does it as he does not understand why he shouldn't.