Annie:The Human Scratch Post

So this afternoon Gabbie is behind the computer chair I was sitting in,with the back of the chair veered to the right. Apparently Gabbie was trying to get to the top of the chair. Missing,sadly and used my back as a scratch post. OoO did I yell,it took her a few seconds to dislodge her wonderful claws of pain from my back and shirt. After I told her what a bad kitty she was for doing such thing she casually walks to a chair a few inches away,plops down and SLEEPS!!!! One minute she is psycho kitty and the next she acts like an innocent little angel. Is it possible to get cats to wear kitty mood rings or something?