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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Scrubs Quotes

Perry, what has two thumbs and still doesn't give a crap? Bob Kelso! I thought we'd met.

Dr. Kelso

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?