The author (Palanhuik, sp?) wrote the "core" of Fight Club in 2 hours (it's either Chapter 5 or 6, from memory). It "came to him," wasn't entirely his own work, the keys on his typewriter just getting tapped. I do not remember which author-interview he states this in, but his creative processes are worth listening/exploring (for both writers and not).

>the film adaptation rivals the original work

He was heavily involved in the film adaptation.

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Rant (his other great book, IMHO) is Freudian time-travel-rape at its best (worst?) – I don't even like the genre! but his perspectives help you think beyond normalcy/complacancy, however offputing.