The Final Countdown, Gob and all that shawesomeness.

caveatPatchor.js

var theFinalCountdown = true;

if (theFinalCountdown) {
  Campfire.TheFinalCountdown = Class.create({
    initialize: function(chat) {
      this.chat = chat;
      this.id = 1;
      this.images = ["http://26.media.tumblr.com/tumblr_li5rrfudu21qz64oio1_500.jpg", "http://images2.fanpop.com/images/photos/3600000/GOB-Animated-gif-arrested-development-3695155-284-152.gif"];
      this.track = "http://dylanegan.com/etfc.mp3";
      this.prefix = "etfc_";
      this.slightlyLessAnnoying = false;
      var messages = this.chat.transcript.messages;
      for (var i = 0; i < messages.length; i++) {
        this.gobEm(messages[i]);
      }
    },

    gobEm: function(message, autoplay) {
      var matches, src;
      var image = message.bodyElement().getElementsByTagName('img')[0];
      var autoplay = autoplay || "";
      if (typeof image != "undefined" && image !== null && this.images.indexOf(image.src) >= 0) {
        var audio = document.createElement('audio');
        audio.src = this.track;
        if (this.slightlyLessAnnoying !== false) {
          audio.autoplay = autoplay;
        }
        audio.setAttribute("id", this.prefix + this.id);
        image.setAttribute('data-audio-id', this.prefix + this.id);
        document.body.insertBefore(audio);
        this.id += 1;
        image.onclick = function(e) {
          e.preventDefault();
          var audio = document.getElementById(this.getAttribute('data-audio-id'));
          if (audio.paused) {
            audio.play();
          } else {
            audio.pause();
          }
        }
      }
    },

    onMessagesInsertedBeforeDisplay: function(messages) {
      for (var i = 0; i < messages.length; i++) {
        this.gobEm(messages[i], "autoplay");
      }
    }
  });

  Campfire.Responders.push("TheFinalCountdown");
  window.chat.installPropaneResponder("TheFinalCountdown", "thefinalcountdown");
}