Apparantly your handwriting - the way you form your letters, write yoru cursives and slant your text, reveals alot about your personality. The science of Handwriting Analysis is called Graphology and has been around since quill has been on paper.
Real Simple Magazine has a easy series of lessons to help you analyze your handwriting while How Stuff Works goes into all the great details of graphology's history and even its use in law enforcement (wow):
In the world of forensic analysis, which includes crime scene investigation, DNA testing, fiber analysis, fingerprint analysis, voice identification and narcotics analysis, to name just a few of the disciplines, handwriting analysis fits into the area of questioned documents. Questioned document examiners (QDEs) analyze documents for signs of alteration, forgery and, when sample documents are available, handwriting or typing comparisons to determine or rule out authorship (and/or tie a document to a specific machine in the case of typing). Handwriting analysis is a tedious and methodical process that relies on extensive knowledge of the way people form letters, which characteristics of letter formation are unique and the physiological processes behind writing - the ways in which a person's fine-motor skills can affect his or her handwriting and leave clues about the author's identity.
I find handwriting analysis fascinating. In fact I know of one executive recruiter firm that uses graphology to judge whether someone is good for a certain job opening. Check out these books on handwriting analysis and see if you can fool the experts!