^Oh, the parasite line was brilliant. I don't think it was that one that Thames is talking about though. I believe she means the one where the pregnant woman has lung cancer and they have to let her die to save the baby (1x18: Babies and Bathwater), while your quote comes from 1x04: Maternity.
Jill: Can you do anything about it?
House: Only for about a month or so. After that it becomes illegal to remove, except in a couple of states.
Jill: Illegal?
House: Don't worry. Many women learn to embrace this parasite. They name it, dress it up in tiny clothes, arrange playdates with other parasites...
Jill: Playdates?
House: It has your eyes.
I think my favorites are still:
Patient: I can't get my contact lenses out-
House: Out of what? They're not in your eyes.
Patient: But they're red.
House: That's because you're trying to remove your corneas.
Cuddy: Just enlarged hylar lymph nodes.
House: Tiny unicorns goring his bronchial tubes would be cooler.