Make Love Not Spam

The anti-spam screensaver from Lycos UK. It's illegal to operate in many places, because it commits DDoS attacks. Any reputable ISP would cancel your Internet account for using it, as well.

The Make Love Not Spam screensaver uses your computer's idle time to commit Distributed Denial of Service attacks against spammers' servers, so the spammers are retaliating with DDoS attacks against the server that offers the screensaver download.