The Enneagram!

This unnervingly accurate personality breakdown has been developed over hundreds of years, outlining just nine distinct core personality types into one of which each of us can be categorised! Jacoby is a 3, theGENERAL is a 5 and Jones is a 6. For best results, go around wrecking your mates' heads telling them that their personality is based entirely on paranoia, fear or inadequacy.

http://www.enneagraminstitute.com/

Note: It is also quite predictable how you will react to the enneagram!..
If you are a 3: You will learn all you can about the enneagram and attempt to become the BEST POSSIBLE 3 THE WORLD HAS KNOWN!
If you are a 4: You will hate your number and realise how lame the world really thinks you are!
If you are a 5: You will find it interesting and be comforted in the fact that the world does in fact function as you have observed... then go into hiding for six months to analyse this new information
If you are a 6: You will immediately dissect the system pointing out all the holes in it and pulling at them relentlessly,until it all falls apart at your feet and you are left safe in the knowledge that you are correct....
..... but still a little uneasy.
If you are a 7: You probably haven't read this far and have already flicked to the games section, played each game for 10 seconds, then turned off the computer and gone bungee jumping.

(not too sure about the other numbers)