Absolutely one of my two favorite books of all times. It is simply brilliant.
My favorite passage: (well, one of them at least

) -an exchange between Yossarian and Doc Daneeka.
"Is Orr crazy?"
"He sure is," Doc Daneeka said.
"Can you ground him?"
"I sure can. But first he has to ask me to. That's part of the rule.
"Then why doesn't he ask you to?"
"Because he's crazy," Doc Daneeka said. "He has to be crazy to keep flying combat missions after all the close calls he's had. Sure, I can ground Orr. But first he has to ask me to."
"That's all he has to do to be grounded?"
"That's all. Let him ask me."
"And then you can ground him?" Yossarian asked.
"No. Then I can't ground him."
"You mean there's a catch?"
"Sure, there's a catch," Doc Daneeka replied. "Catch-22. Anyone who wants to get out of combat duty isn't really crazy."
"That's some catch, that Catch-22," he (Yossarian) observed.
"It's the best there is," Doc Daneeka agreed.
Man, this makes me want to read it again. Absolutely incredible book.
-math