This simple script checks all the links on a page, and blocks out certain the ones you specify. This works especially well for shock sites, so you won't be tricked into following a link to Goatse or Tubgirl. Takes an array of regular expressions to check each link against, and contains a "prompt" variable, whether to prompt the user if a link is blacklisted, or to remove the link entirely.

I encourage you to customize this script, as it was thrown together rather hastily, and could be better. (along with adding some more sites to the list)