Web gray goo: the end could be near :}

''The 12-million-computer strong Conficker botnet will fall under human control on April 1, leading some to speculate feverishly about what horror awaits an unsuspecting internet on what may be our last April Fools' Day ever.
...
The imagination reels at the possibilities of a botnet that contains 20 percent more computers than the last doomsday worm, which, as you know, killed us all. '' [source]