pneumonoultramicroscopicsilicovolcanoconiosisophobia

One hell of a word.
A fear of...
pneumonoultramicroscopicsilicovolcanoconiosis, which is, according to Oxford Dictionary..:
"a lung disease caused by inhaling very fine ash and sand dust."

Doc: I have bad news.
Patient: What? Do I have pneumonoultramicroscopicsilicovolcanoconiosis?
Doc: No, you have pneumonoultramicroscopicsilicovolcanoconiosisophobia.