Cameron finds Foreman brooding in the doctor's lounge. Somehow, she hasn't heard about the miraculous cure for polio that was discovered right within PPTH's walls. It's like no one cares anymore, you know? Cameron did, however, discover some humility and self-realization, which is nice. She says that while she's happy she "changed jobs," she also knows she'll never have the same "excitement" she had as a Cottage. Excitement that included, as she admits, being stabbed with a contaminated needle by her own dying co-worker. Wow, that's almost as much fun as the time I went to eat my frozen meal for lunch at my job, only to find that someone else had stolen it, leaving me lunch-less. Fond memories indeed. "I miss people doing whatever it takes to get the job done," Cameron says. Um...how about, instead of missing your old job that did that, why don't you do that in your new job in the ER, WHICH SHOULD ALREADY BE DOING THAT BY THE WAY. What the hell kind of hospital is Cuddy running here? An ER filled with people who half-ass their patient's treatment? A diagnostic department whose definition of full-assing it includes subjecting patients to numerous painful, expensive, and unnecessary tests? Wilson? Come on! At least Cameron can admit that she's having trouble giving House up, and that's why she messed with his case. Foreman says if the Numbers hadn't screwed with him, Casey would have died. Cameron pep-talks Foreman that while he'll never get everything right, he won't get everything wrong, either. Tell that to Lupe of the Bra Infection!

House returns to PPTH after a two-day absence. Kumar proudly tells him that "we" cured Casey's polio with Vitamin C. Uh, no, you didn't, Kumar. Random Guy did. House finds this hard to believe, and Foreman enters with some proof that will make it even harder. He tested Casey's blood that was drawn when she was admitted to PPTH -- and it was negative for polio. That means, Foreman says, that Random Guy screwed up his lab test. I guess the results said "poliNo," and he misread them. But, CTB points out, Casey is walking out of PPTH, so she was cured of something somehow, right? Foreman says it could be one of those fun intermittent diseases, like porphyria. House doesn't think so. Foreman asks if House would rather believe that Random Guy cured polio with Vitamin C. House says it's either that, or someone poisoned Casey with thallium to give her the same symptoms as polio, then faked her lab tests to say she had it. Then he'd have to stop the poisoning when the Vitamin C was administered, thereby making it seem like the Vitamin C cured her. House says that's rather complicated, although, come to think of it, "it is rather doable, right?" He looks at Random Guy when he says this, then asks if they should test Casey for thallium. The Numbers get horrified expressions on their faces. Classroom time has just gone horribly wrong. "You poisoned her?!?" 13 asks, a bit slow to catch on. Yes, Casey really was just suffering from heat stroke after all. It was only after Random Guy started poisoning her with thallium that she got new symptoms.