Anybody who had the pleasure to go through relationship with mentally unstable person (for the lack of better words, if I had to guess some undiagnosed borderline disorder on a scale 1-2 out of 10 mixed with some childhood traumas) sees nothing out of ordinary - just daily chaos, tantrums, illogical destructive behavior and very little self-control on the other side.

Narcissism adds a curious twist, but of course for the worse.