According to Dr Elayne Kahn your Halloween costume reveals a lot about ones personality:
Witches: Enchanting people, take control in romantic situations. Always honest about their feelings.
Politicians: Suspicious of authority. Judge people by there actions, not by their words. Opinionated.
Movie Stars: Concerned about reputation, success. Enjoy being the center of attention. Socially active.
Clowns: Sensitive to others emotions, self-assured, can laugh at themselves.
Aliens: Often have a hard time understanding people's intentions.
Monsters: Appear calm, but they're hiding internal turmoil. Have difficulty expressing themselves.
No Costume: You're afraid of criticism. Uptight, you have a hard time letting go. Underneath it all, you have an intense need to be accepted.