Season 7, Episode 4: My Identity Crisis
Original Air Date: 15 November 2007
Turk tries to assure a worried Carla that their daughter will acknowledge her Latin heritage. The Janitor challenges J.D. to identify everyone in the hospital, when it is discovered that he uses nicknames, because he doesn't know the people's actual names. If J.D. can't name all of them, he must take up the mop for a day. Dr. Cox realizes that he is lonely without his wife and children.