Narcissists cut a wide, swashbuckling figure through the world. At one end of the self-loving spectrum is the charismatic leader with an excess of charm, whose only vice may be his or her inflated amour-propre. At the far end of the spectrum reside individuals with narcissistic personality disorder, whose grandiosity soars to such heights that they are manipulative and easily angered, especially when they don't receive the attention they consider their birthright. Here's how to figure out whether the big talker in your office really believes his or her own hype.