I once watched a documentary about this, which defined 7 key characteristics of this disease. Do you or anyone you know display such traits? I kind of used to a little, but grew out of it

1. has a grandiose sense of self-importance

2. is preoccupied with fantasies of unlimited success, power, brilliance, beauty, or ideal love

3. believes that he or she is "special" and unique and can only be understood by other special people
requires excessive admiration
strong sense of entitlement

4. takes advantage of others to achieve his or her own ends

5. lacks empathy

6. is often envious or believes others are envious of him or her