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A scuffle with House lands a gay man with AIDS in the hospital, where he provides the disagreeable diagnostician with a medical puzzle. The man coughs up blood on Cameron, who begins behaving uncharacteristically. Elsewhere, House finds an unusual way to spend time with Stacy.
Dr. Wilson: Trying to win Stacy back by killing an animal. Very caveman.
Mark: What’s going on?
House: It’s not what you think. I know it looks like we’re cleaning dishes, but actually we’re having sex.
Stacy: We’re working.
Mark: Wow, wish I’d become a doctor. This place would be spotless.
Dr. Cameron: I have fun.
Dr. Chase: She has some scheduled for February.
In this episode, we learn that House's street address is 221B (it can be seen behind him as he leaves for work with Wilson). This is an allusion to Sherlock Holmes, arguably the world's greatest fictional detective, whose London address was 221B Baker Street. The two characters are similar in method if not profession: the key to their success is a towering intellect and an almost faultless eye for detail.
House: I had to get rid of it before Steve McQueen ate any Coumadin. I named your rat.
Steve McQueen (March 24, 1930 - November 7, 1980) was an American movie actor. He was considered one of the biggest box-office draws of the 1960s and 1970s due to what many film goers consider a captivating on-screen persona. House called the rat Steve McQueen because he kept escaping from his captors.