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.
Added:
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

Elliot: I'd like to remember all the carpal bones in the hand with a simple mnemonic device: Scaphoid, Lunate, Triquetral, Pisiform, Trapezium, Trapezoid, Capitate and Hamate. Some Lovers Try Positions That They Can't Handle.
Keith: Hey?!?!
Elliot: It was not directed at you, Doctor.

Dr. Kelso: Ahhh! Dr. Turkleton!
Turk: Actually, sir, it's Turk.
Dr. Kelso: That's your first name.
Turk: You think my name is Turk Turkleton?