The Narcissist is an Actor
Not necessarily a good one, though... It seems that a narcissistically driven person has difficulty knowing when they are going "over the top". They seem to over-do everything so much that you often get the feeling like they are acting. Your intuition that they are acting is exactly what you are witnessing. As Dr. Hare describes the narcissist/psychopath: he knows the words to the song, but not the music. They learn what emotions people normally express in certain situations but they don't feel those emotions themselves. The result is that you end up watching their performance and sensing a certain hollowness. It doesn't ring true. Even when witnessing a narcissistic rage you may have sensed the acting job. True rage isn't like a spigot that you can turn on and off. A normal person experiencing rage has a hard time settling down. They have to work on calming themselves. Let a narcissist rage and then the phone rings or another person walks in the room...