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House: You Don't Want to Know
House treats a magician who had a heart attack during an illusion. House doesn't like magicians and figures the guy screwed up, but the tests prove otherwise. Meanwhile, the fellows participate in House's newest game: the winner gets immunity and the chance to pick two other fellows, and House will fire one of them.
Dr. House: I need you to bring me the thong of Lisa Cuddy. Not kidding. Thong. Cuddy. Go!
Dr. House: Stop gloating.
Kutner: I’m not gloating.
Dr. House: Then what’s that smirk?
Kutner: No smirk. This is how I look.
Dr. House: Magic is cool. Actual magic is oxymoronic. Might not even be oxy.
Dr. House: If the wonder’s gone when the truth is known, there never was any wonder.
Dr. Wilson: You know, in some cultures, hiring people to steal someone’s underpants is considered wooing. You should move there. Because here it’s just creepy.
House: I finally have a case of lupus..
House is referring to earlier episodes, particularly in seasons 1 and 2, when doing the differential diagnosis with Chase, Cameron and Foreman. Cameron is somewhat renowned for suggesting that the patient have lupus, in almost every episode. In season 3, we learn that House has carved a hole in a lupus textbook where he keeps an extra bottle of Vicodin. His reason? It's never lupus.