Joey: Look, I've got to apologize on behalf of Carl.
Chandler: Who the hell is Carl?
Joey: Oh, did I not mention? Carl is a guy I hired to be my identical twin for a medical research project.
Chandler: You know, sometimes the good ideas are just right in front of you. Aren't they?
Joey: I know it sounds crazy, but I think it might work. The only problem is Carl's acting.
Monica: The only problem?