Period Detector

  No, this isn't some new spellcheck feature, but it might also be useful...
  If you encounter someone (some woman) in a forum such as this who seems normal one day, but bitchy the next, all you have to do is let this convenient plug-in search and filter all of that person's previous posts, and determine if there is a monthly cycle of exclamation marks, italics or profanity. If there is, you have successfully detected the relevant period, and can set the tool to ignore that user's posts during the times of greatest danger.