That is so funny, PNC! My finaces daughter does the same thing! He'll yell at her about something and when she doesn't behave he'll spank her butt. She'll turn and hit him right back!
At first I was appalled at her, but I realized she learned it from him and his ex. They spank the girl when she does something bad, but she just keeps doing it. And since they can't seem to agree on any other form of discipline (he says no TV, mom still lets her watch it) the daughter realizes the spank is not really a big deal - so she spanks them right back! Of course, they are "easy spankers" - no other objects and no "whoopins". Maybe they need to do more...and I don't even agree with that, but darn this girl is a spoiled brat sometimes!!!!
I hope the kids I have with him are better and we don't have to spank. But check with me in 5-7 years!