A hot shot attitude might annoy your friends and coworkers, but could it be dangerous too?
One study supports their hypothesis that paranoia may come in at least two distinct types: "poor me" paranoia and "bad me" paranoia.
People with this strange disease want nothing more than to be amputated.
Two studies suggest that those individuals most prone to violent behavior are narcissists. In Greek mythology, we know Narcissus as the man who fell in love with his own reflection in the waters of a spring, and whose excessive self-love killed him.