Every disorder is well documented, including common symptoms, causes, and treatment options, along with a handy quiz for easy self-diagnosis. And in case you can't tell whether or not you're losing it, each entry includes a sample inner monologue detailing the thought processes at play--because sometimes you don't know you're crazy until you see it in writing.

This humorous guide to the nuttiness within all of us will have even the most rational thinkers second-guessing their sanity.