Sociopath
You are 100% Rational, 29% Extroverted, 86% Brutal, and 57% 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. Except sugar. That just may be sweeter. In short, your
personality defect is the fact that you could easily be a sociopath,
because you are calculating, unemotional, brutal, and arrogant. Please
don't kill me for writing mean things about you! I have a 101 mile-long
knife! Don't make me use it!
Classic, the test doesn't consist of any real measures, though, for example I don't recall answering anything about brutality, other than getting angry/irritated.