Hacker (being targeted = instakilled)
A hacker was sighted on the server Tichondrius and was in Stormwind killing teammates just by targeting them. I wasn't on the server at the time but I found some footage of this:
Theres also some more footage I found of it being used on bosses:
Just showing that no game is 'unhackable' or 'hack secure' as many people thought wow was both. This is also proven not to be a private server, as there is many topics on the WoW forums about this.

Modified WoW+ hack (shared only between VIP members of one website), which has been fixed in a few hours.