Cyberarmy
Love fool
I do remember the immense amounts of butthurt the zombie event caused in WoW.
That was the best part of WoW and many players cried rivers because of this stuff.
Same thing happened with Hakkars blood bug, nearly all life was exterminated on some servers
Edit: I don't think we'll ever see something like UO again at least officialy...
I tried to get into EVE so many times but its combat mechanics really piss me off as a dog-fight lover.