Me-Against-Them Mentality (CSC)

__TOC__
: "OK, so you trash the high priest and his pals. Well, just as the old guy is dying from Thuenor's sword thrust, he pulls on a hidden cord The loud gong summons every priest in the castle, and they all appear in were-beast form. Meanwhile, an 18 inch thick steel plate blocks the exit."
: "I think she's mad at us, Frank, what do think?"
This is an extension en masse of DM pettiness. Maybe the players ganged up on the DM, foiling his best plans or backing up a fellow player's disagreement with a judgement call. So the DM retaliates. Neutrality is cast aside and the game becomes a shooting match, one that the D M can always win.
When someone realizes what's going on, either DM or player, they should speak up and stop the madness! lake a break, NOW! During the break, re-establish a policy of fair and informed decision making and mutually discussed disagreements. Consider replaying events that occurred after things got out of hand, allowing the DM some leeway to account for player knowledge of the situation.