NPC= Non Playable Character
The character or characters in a video game that are controlled by the game.
They speak scripted words. Say what they are told.
It's been noticed that the letters M, O, and B are each one letter position shy of N, P and C!
MOB or NPC, think of those "progressive" protesters who chant the same scripted words, seemingly with no original thought.
And then there is this:
Edit: Eaton Rapids Joe also posted about NPC with some good insight.
Edit: Francis W. Porretto at Liberty's Torch also.