Take the quiz at dicepool.com
More important than the results is the disclaimer:
This survey is completely scientific. Despite the mind-boggling complexity of mankind, the billions of distinctly different personalities found on Earth can easily be divided into seven simple categories that correspond to the five Platonic solids, a pseudo polyhedron, and whatever the hell a d100 is. The results of this quiz should be considered not only meaningful but also infallible, and pertinent to your success as a fully realized individual. If you feel the results of this examination do not match your perceived personality, you should take whatever drastic measures are needed to cram your superego back into proper alignment, as described by the quiz results.