If you're a Cthulhu fan (and c'mon... who's NOT?!), you have to read this. I always go back and read the survival guide every few months because it's so damn funny. That is I read it when I can freakin' find it.
If you've read most or a few of Lovecraft's short stories, you'll recognize many of the references. If you haven't read Lovecraft... well... ummm... you suck.