Wilson is telling Kalvin the news right now. Kalvin takes it well enough, having some experience with getting really bad health news. Wilson says that they need to biopsy the tumor in Kalvin's heart. The procedure could be dangerous, Wilson explains. Kalvin's dad sits outside and looks sad about stuff.
Chase gives Cameron some Ativan for her meth hangover. Awww, he's like the guy who makes you breakfast in the morning, except that he's a total slimeball. Chase doesn't think they should have sex again. Cameron doesn't think Chase should presume that she'd want to. Chase explains that when two people have sex and it's a fun time, they usually do it again. "And that's when things get complicated," Chase adds, as if the fact that he had sex with her while she was high on meth and probably ecstasy and all their co-workers know about it didn't already complicate things. As a consolation prize, Chase tells Cameron that she "didn't suck" in bed. I guess Cameron's not a downtown girl.
The rat problem solved, Wilson tells House that he'll have to figure out another way to insinuate himself into Stacy's life. Wilson's suggestion is to hit another patient, but House turns that down, saying that it would be repeating himself and therefore "formulaic." And yet...House exposits that Steve has a lung infection from Stacy's cigarette smoke and will need two weeks of antibiotics and a cigarette smoke-free environment. Wilson is appalled that House brought a sick rat into a hospital full of people with compromised immune systems. House says that this particular rat infection doesn't spread to people. Wilson points out that it did during the black plague, and that rats are known to carry all kinds of other diseases and parasites that could spread to humans. House makes his "brilliant idea" face, and asks Wilson whether he noticed that Kalvin's dad was sweating. Wilson doesn't answer, but House tells him to cancel Kalvin's biopsy, since it will surely kill him.