When J.D. is bothered by Elliot and Dan's romantic involvement, Turk encourages him to use the hurt brother excuse to break em up.
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Dan (Tom Cavanagh), J.D.'s brother returns with some depressing news: their father died.
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Molly and Elliot argue on how to handle an ex-drug addict patient of Elliot's.
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Turk and J.D. come up witha new name "Gravelling" where they put themselves in other peoples' shoes.
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Turk and Dr. Cox are stumped on how to remove a light bulb from a patient's bum.
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Heather Graham debuted on Scrubs during season four as Molly, the hospital's new psychiatrist.
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Things don't go as planned at Turk and Carla's wedding and they end up at the hospital, where they actually get legally married.
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A picture of the happy couple, Carla and Turk at their practice ceremony.
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J.D. is happy to steal Elliot away from Sean, but how long will that feeling last?
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Dr. Kelso learns why you do not take the emergency exit out of the hospital.
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In a story narrated by Turk, he ends up making a mistake during surgery that costs a young concert pianist his career. High five!
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J.D. must keep a secret when he learns that Carla goes for dinner with a what-if guy.
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Scrubs Quotes

J.D.: Hey, I heard a great joke. A guy walks into a dentist's office and says, "I think I'm a moth." And the dentist says, "Well, if you think you're a moth, why are you at a dentist's office?"
J.D.'s narration: Oh, no, I forgot the punchline... You can't bail out now! Stall! Stall!
J.D.: ...So the moth says "That's a good question. What kind of dentist are you?" And the dentist says, "Well, I'm a general dentist, but I...I do dabble in orthodontry - braces and such." And... and the moth says, "Orthodontry? I hear there's great money in that."
J.D.'s narration: "The light was on"!
J.D.: "But! To answer your original question, which was, if I think I'm a moth, why am I in a dentist's office? The answer is, Because the light was on!" The light! The light, James. Moths love light. So, James, other than your funny bone being broken, what seems to be the problem?

J.D. [to Cox]: you won't admit this, but you're in love with Carla.
Carla: No, he's not.
Dr. Cox: Actually, I am.
Carla: You're starting again.
J.D.: And Carla, you're mad that Turk didn't trust you enough to tell you.
Turk: See? Trust, woman, trust!
J.D.: Whatever. The point is that Turk is sorry.
Turk: Not anymore!
Carla: I can't believe you thought he was a threat.
Dr. Cox: I'm a threat!
Carla: You're not in love with me, you idealize me.
J.D.: Can we just try and stay focused...
Turk: You're mad 'cause I'm scared of losing you?
Carla: Yes, because we're stronger than that!
Dr. Cox: Apparently not!