A typical "DNB" will do things far beyond what any normal person will do to please their superiors; often without any additional compensation, reward or recognition.
DNB's alienate their peers due to their weasely kissy-ass nature, and often believe they hold an advanced supervisory position - often implied by their boss in order to boost their ball attentiveness.
Employee - "Gargle Gargle!" ("Yes Sir!")
Boss - "Um, SURE you're the nightshift super*mumble*...as long as you keep letting me know who's goofing around!"
Employee - "Gargle Gargle!"