I took my time with this one, savoring it (translation: not reading it while cooking pasta). I'd read it once before, back in college, and it didn't click with me then.
Now I get it. I'm flat amazed at the sheer amount of detail Heller was able to pack into his story, the deft characterizations, and most of all the tone. The slide from farce into outright horror is inexorable yet so subtly done that when we're finally given the full truth we're nearly as shaken as Heller's protagonist Yossarian is.