Harry Potter personality test
Harry Potter Personality Quiz by Pirate Monkeys Inc.
(In case the site disappears and the link to the pic no longer works): You are... Severus Snape: INTJ
INTJs are resourceful, perfectionistic and reserved. They excel at planning and strategy and, though they prefer to avoid drawing too much attention to themselves, they can be effective leaders when the need arises. INTJs do not often express strong emotions but can become animated when provoked.
Snape kicks ass.