Interesting thing that narcissists often do is the same behavior that immature children often do~ they don't know how to accept gifts or compliments.
Often, when a narcissist receives a gift, they will not accept it gracefully, they will look it over and assess it, judging whether or not they like it or approve of it. If they don't LOVE it, just like a child who has not learned manners, they will SAY SO. They will often reject the gift outright, as if the gift giver has insulted them with their "dumb" gift.
The Narcissist feels entitled to receiving gifts, large or small, and has not matured enough to understand that the people in their lives do not exist to serve them.
If the N loves the gift itself, they will often do something else interesting; they will assimilate the gift into their list of accomplishments. As if they acquired it on their own. They simply "delete" the fact that the gift was GIVEN to them by another person, and rewrite the story to make themselves the person who went and got the thing, or the money. They see it as something they earned, or found, or created, not as something that was given to them. It looks like it's a way to avoid showing gratitude, but N's seem to actually believe their own reality-rewrites.
An exception to this behavior is when the Narcissist has something to gain by displaying good manners; if a person they have a crush on, or a person they want to impress or get on their good side, gives them a gift, then the "good manners" come out, as if it's a natural part of the N's day to day personality.
Often if you compliment a Narcissist, they will not say "thank you", they will hear the compliment as an expression of awe about their magnificence, and take the opportunity to expand upon how wonderful and important they are. This Is Spinal Tap has a wonderful scene spoofing this (Language Alert):
http://www.youtube.com/watch?v=NgViOqGJEvM
