Back in the day, I randomly grabbed a copy of one of Pratchett's books as I bulked up my reading list for the next day when my vacation started. I woke up to 9/11 and the news of the four hijacked planes. Shocked and stressed, with the news playing in its continual loop in the background, I started reading "Jingo" - having no idea what the book was about, only that I needed something to distract me. I certainly didn't distract as I immediately saw the paralells, instead it helped me get through that week a little more sanely, a big scoop of anger taken out of me. I'll always be thankful to Pratchett for that.
If you're into stuff like this, you can read the full review.