reddit

“"With the help of a lovely little service called Upside-Down-Ternet, you can turn that Wi-Fi thief's free Internet scheme upside down--literally. With a little clever scripting, every image the thief views via your connection is flipped upside down on his monitor and mirrored, making Web browsing difficult to say the least. You can also redirect every Web request the thief makes to a particular site--the author of the hack suggests Kittenwar. Pretty good, but I would go with an old standby."” source...