Probably over the heads of non-sysadmins, but the screenshots at the end are of greatest value: using Linux firewall software, you can screw with computers on the network, flipping images or blurring websites -- and, using that sort of script, you could easily do word-replaces, Dialectizing or ROT-13ing the webpages of anybody stealing your bandwidth (or changing colors, or stripping HTML to plain-text, or...). I like the 'blur' screenshot, though: just noticably subtle enough to make someone think their own computer is screwed up.
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