Whatchu talkin' bout Willis?

I may be dating myself here, but if any of you ever watched the 80's show "Different Strokes" when you were younger ( I was under the age of 10, I'm pretty sure!), you would know that little Arnold would always say, "Whatchu talkin' bout Willis?" to his older brother while making this puckered lip face. Addison did this face all day, no matter what she was doing last Sunday. It was generally very serious, and it cracked me up! I've hardly seen her make the face since - such a funny thing to do for no reason.