Joke of the Week #78

Sally: "Quick, ask me if I'm a ferret."

Nona: "Okay, are you a ferret?"

Sally: "Yes, I'm a ferret. Now, ask me if I'm an elephant."

Nona: "Okay, are you an elephant?"

Sally: "No, don't you remember? I just told you I was a ferret!"

From Nickelodeon Magazine.