Just don't yell @ him and smack his hand every time he does it.

That was how my mom treated mine and that would be why I still pull out my hair. The worst thing is I'm 25 and if she sees me doing it she still does it, even in public, even when i'm going to just scratch my head. What the what?!?!?

And this is one of the many reasons she will be receiving nothing this mother's day.