Z's budding sense of humor

It started when I was reading her first word books and misidentifying the pictures. I'd point to a chair and say, "That's an elephant" or "Elbow." And Z would look at me like I was insane and go, "No, dat's not Cookie Monster. Dat's a little girl!" But she quickly caught on that we were playing a game, and now she mislabels pictures herself and looks expectantly at me to laugh and correct her. She also thinks it's hysterical when I get the names of her body parts wrong or when I suggest we put her shirt on her legs, her diaper on her head or her hat on her belly button.