My cat goes and socializes with the local cat gang during the day.. lots of fighting, some romancing.. then comes back home and pretends to be all cute and innocent.
My mom has been trying for years to get him to say "Ma-ma". He never quite got the point of it, so these days when he really wants some food or to be let out, he'll say, "Ma ma ma ma ma ma ma ma ma ma ma ma ma ma ma ma ma ma ma ma ma ma ma ma ma" in rapid succession until we all go crazy.