A crash course in changing the world.
For example: We did a "Peacebuilding" series in Warcraft. The quest(ion) was: if we want to bring peace into one of the hot conflict zones within WoW - how would we do it ? Players were invited to roleplay this epic quest, research strategies (UN Peacemaker Portal, etc.) and share about it. Our Players receive points, rewards and achievements on our Guild Website for writing creative stories, producing machinimas etc.
During one of our peace missions we had a PvP (Player vs. Player) situation in which the opposite fraction - not knowing about our peace intentions - slaughtered our Group in one conflict zone. The Game mechanics of WoW does not allow chat from the opposite fraction to be understood and transforms all words into glossolalia. So we could not communicate - just with simple emotes and moves.
We did a "Gandhi approach" and just faced our aggressors without aggression - standing calm, returned from the grave yard and showed up again. The opposite fraction became insecure about what we are up to and some of them stopped their action because there was no honor/fun in killing players that do not fight back. Some of them joined our fire that we were circling around and a simple emote conversation started with some opposite players holding their fellows back from a new fight.