For those of you who don't know what the DSM IV is, it's the psychologist's tome of disorders.
Now, I'm not big on self-diagnosis for anything (except for recurrent medical things that you've had before, like sinusitis or bronchitis... If you've had those a number of times, you know what it feels like and what the symptoms are), but damn is it nice to label people, even if it's just to yourself.
Crazy Co-workers? Oppositional Defiant Disorder.
Whacked out Ex? Narcissistic Personality Disorder.
Student that scares the shit out of you? Conduct Disorder.
Of course, it gets a little scary when the diagnostic section says "four or more" and you recognize three of them in your behaviours.
But hey, we all have issues. One of mine? I love labeling people. This is why I people-watch. Not because they're interesting, but because I create a running monologue of that person in my head.
I guess we're all a little crazy.