"Anji keeps coughing, Doctor."
"I'll have a look at her, Fitz."
Later:
"I'm afraid she has pneumonoultramicroscopicsilicovolcanoconiosis."
"What!"
"Pneumonoultramicroscopicsilicovolcanoconiosis."
"I heard you the first time. What does it mean? Are you just making it up?"
The Doctor looked wounded. "No, Fitz, it's real. You contract pneumonoultramicroscopicsilicovolcanoconiosis by breathing in air contaminated with volcanic ash."
"Oh, so when she was separated from us at Popkettle—"
"—Popocatepetl—"
"She got caught in an ash cloud and contracted ultranumovolcanicwhatsis?"
"Pneumonoultramicroscopicsilicovolcanoconiosis."
"Right, that, whatever it's called."
"It describes a serious medical condition and shouldn't be floccinaucinihilipilificated."
"Now you're just showing off, Doctor."
"I suppose so."