Downloading Is Wrong

So technically I suppose this would be considered using a virus for "good" purposes -- at least in theory.

Trojan Blocks The Pirate Bay and Mininova

A new trojan popped up at several torrent sites a few weeks ago, one that blocks access to The Pirate Bay and Mininova, while informing its victims that “downloading is wrong.” The trojan edits the hosts file on Windows machines, and redirects the BitTorrent sites to localhost, making them impossible to load.