Catch 22 Chapter 2

[book_mrow]

“Appleby isn’t even here,” Clevinger pointed out triumphantly to Yossarian. “Who said anything about Appleby?” Yossarian wanted to know. “Colonel Cathcart isn’t here, either.” “Who said anything about Colonel Cathcart?” “What son of a ***** do you hate, then?” “What son of a ***** is here?” “I’m not going to argue with you,” Clevinger decided. “You don’t know who you hate.” “Whoever’s trying to poison me,” Yossarian told him.

What's the conversation about...???

[MANICHAEAN]

Yossarian is paranoid about someone trying to poison him.
Clevinger is trying to introduce factual logic, but Yossarian is having none of it.