Quote from Joey in The One with the Ballroom Dancing
Joey: Please don't kick the girls out. This was my fault. Mr. Treeger: You want me to kick you guys out instead? Joey: No, you can't do that. Where would the chick and the duck live? Mr. Treeger: You have pets? Joey: No. Those are nicknames. I'm the "chick," and Chandler's the "duck." Mr. Treeger: Huh. I would've thought it was the other way around.