Hungry Joe’s inverted set of responses was a curious phenomenon to everyone but Hungry Joe, who denied the whole thing stubbornly.
If there was no rain at all, there were freakish, inexplicable phenomena like the epidemic of diarrhea or the bomb line that moved.
Yossarian bounded up with a one-syllable cry that crackled with anxiety and provided the only rational explanation for the whole mysterious phenomenon of the flak at Bologna: Orr!
Good God, how much reverence can you have for a Supreme Being who finds it necessary to include such phenomena as phlegm and tooth decay in His divine system of creation?
He knew, for example, that it was called paramnesia, and he was interested as well in such corollary optical phenomena as jamais vu, never seen, and presque vu, almost seen.
It was possible that there were other vus of which he had never heard and that one of these other vus would explain succinctly the bafing phenomenon of which he had been both a witness and a part; it was even possible that none of what he thought had taken place, really had taken place, that he was dealing with an aberration of memory rather than of perception, that he never really had thought he had seen, that his impression now that he once had thought so was merely the illusion of…
…in the God of his fathers — would truly have resigned both his calling and his commission and taken his chances as a private in the infantry or field artillery, or even, perhaps, as a corporal in the paratroopers — had it not been for such successive mystic phenomena as the naked man in the tree at that poor sergeant’s funeral weeks before and the cryptic, haunting, encouraging promise of the prophet Flume in the forest only that afternoon: ’Tell them I’ll be back when winter comes.’
There are no more uses of "phenomenon" in the book.