Another possibility I didn't think of before: what about Wild Cards? Assuming no one's squeamish about dealing with, y'know, vulgarity and sex and such. The downside is people would probably either have to own a copy already, or be really lucky, or get a used copy somewhere. I'm guessing because of that it probably wouldn't be feasible, but thought I'd at least throw the idea out there, since the previous suggested book would be really hard to do in one month.
There were some other suggestions as well though, and tomorrow or even later tonight I'll probably throw them all into a poll or something.