12. They have conversations with themselves.
I’ve heard many a narcissist talk to themselves–and actually answer themselves back. Does this mean they are insane? Do they hear voices in their heads? Or are they practicing what they might say to someone in a hypothetical conversation ahead of time (remember, everything they do is fake, so they might have to pre-plan how they will respond to others in advance)? Who knows? I just know it’s weird as fck. My ex used to do this all the time–in front of a mirror too.