Smart tip from the Mahablog: Particularly now, go read this description of narcissistic personality disorder.

...Within relationships, individuals with NPD expect admiring deference, have a noncontingent love of self, and take presumptive control of others. They often behave with contempt toward those with whom they are involved. They see their own achievements in grandiose and inflated terms while devaluing the contributions of others. At the same time, these individuals have an extreme vulnerability to criticism or being ignored....

Remind you of anyone?