meude:

Author Chuck Palahniuk first came up with the idea for the novel after being beaten up on a camping trip when he complained to some nearby campers about the noise of their radio. When he returned to work, he was fascinated to find that nobody would mention or acknowledge his injuries, instead saying such commonplace things as “How was your weekend?” Palahniuk concluded that the reason people reacted this way was because if they asked him what had happened, a degree of personal interaction would be necessary, and his workmates simply didn’t care enough to connect with him on a personal level. It was his fascination with this societal ‘blocking’ which became the foundation for the novel.

(Source: filmtrivia)