Quote from Dorothy in The Monkey Show
Stan: Dorothy, what's happening to us? Dorothy: I don't know. I was thinking about it myself. I don't approve of you and Gloria, but if you honestly love her You know, I don't think I love her. Stan: I'm realizing that maybe I was with her just to make you jealous. It was the same thing with the monkey. Dorothy: You know something, Stan? I was a little jealous. Stan: Dorothy, it was just an old traffic cone with a monkey head on the top. Dorothy: Jealous of my sister, you idiot.