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Bonus: Conficker a bust, fails to do anything
There's a bonus: the Conficker worm. The kicker here is that it was actually real and set to 'blow up' on April 1, 2009. But nothing actually happened. The worm spread through machines across the world and was set to activate and receive instructions, in what was thought to be one of the largest botnets of the time, but command servers never sent the instructions. While most weren't laughing, it turned out to be on the most part a busted flush.