I was not previously aware of the fact that there are NBA security guards whose job it is to prevent players from getting too close to the referees during video reviews. But as the video above shows, such security guards do indeed exist, and one of them got into a hilarious tête-à-tête with Dirk Nowitzki at the end of last night's Mavericks-Kings game.

Like any good defender, the security guard stays right up in Dirk's jersey, stays low, and moves his feet. Dirk even tries to throw a stutter step move at the 32-second mark, but the wily old man quickly locks Dirk up with his superior lateral quickness, before whispering what we can only assume was some withering trash talk in the big man's direction. Don't bring that weak-ass shit in this guy's house, Dirk.