One of the products of 18-year-old German hacker Sven Jaschan, Netsky became one of the most common worms spread via email in the world. It is believed to have been part of a cyber war with the authors of the worms Bagle and Mydoom, containing insults in its code and even removing them from systems where applicable. It also caused annoying beeping noises at random times of day—you know, for kicks.