Took this personality defect test (You have to sign up for some dating service or something to see the results, so only do it if you're really, really bored at work, ok?). My results seemed to be in alignment with certain criticisms i've heard over the years. Click here to see my results.

heh. i should have seen this coming.
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You are 57% Rational, 14% Extroverted, 57% Brutal, and 71% Arrogant.

You are the Sociopath! As a result of your cold, calculating rationality, your introversion (and ability to keep quiet), your brutality, and your arrogance, you would make a very cunning serial killer. You are confident and capable of social interaction, but you prefer the silence of dead bodies to the loud, twittering nitwits you normally encounter in your daily life. You care very little for the feelings of others, possibly because you are not a very emotional person. You are also very calculating and intelligent, making you a perfect criminal mastermind. Also, you are a very arrogant person, tending to see yourself as better than others, providing you with a strong ability to perceive others as weak little animals, so tiny and small. You take great pleasure in the misery of others, and there is nothing sweeter to you than the sweet glory of using someone else's shattered failure to project yourself to success.

Your exact opposite is the Hippie.

Other personalities you would probably get along with are the Spiteful Loner, the Smartass, and the Capitalist Pig.