NSFW Warning: There's some cursing.
On the EU Tournament Realm a few Blizzard Community Managers got together and went up against Wargame in an arena match. The result? Vashj and Ragnaros made their presence known, amongst others.
It's a good video to watch and fun to see these NPCs totally out of context. It reminds me of the good ol' days at the end of betas when entire cities would be destroyed by spawning Azeroth's worst nightmares. Lord Kazzak stomping around Stormwind and Orgrimmar killing everything he sees? Yes please.
The moral of the story is that you should always be nice to the blues. You'll never know when they'll come in and purge you with fire.