The Corrupted Blood incident is a video game glitch and virtual plague
that occurred on September 13, 2005 in the MMORPG World of Warcraft.
The epidemic began with the introduction of the new dungeon Zul'Gurub
and its end boss Hakkar who, when confronted and attacked, would cast
on players a hit point draining and highly-contagious debuff spell
called "Corrupted Blood."
The spell, intended to last only seconds and function only within the
new area of Zul'Gurub, soon spread across the virtual world when
players discovered that the use of teleportation spells could take the
affliction out of its intended confines. By both accidental and
purposeful intent, a pandemic ensued that quickly killed lower-level
characters and annoyed higher-leveled ones, drastically changing
normal gameplay, as players did what they could to avoid infection.
Despite measures such as programmer-imposed quarantines, and the
players' abandoning of densely populated cities (or even just not
playing the game), the epidemic was only finally controlled with a
combination of patches and resets of the virtual world.
The conditions and reactions of the event attracted the attention of
epidemiologists for its implications of how human populations could
react to a real-world epidemic. Anti-terrorism officials also took
notice of the event noting the implications of some players planning
and perpetrating a virtual biological attack.
http://en.wikipedia.org/wiki/Corrupted_Blood_incident
This happened in 2005. Incase I am not the only one that never heard
of it.............