[Facebook Gags Collection]: *bad day* -> 'CAUSE YOU HAD A BAD DAY

fbg_badday.user.js

// ==UserScript==
// @name        Facebook Gags: bad day
// @namespace   gags
// @description *bad day* -> 'CAUSE YOU HAD A BAD DAY
// @include     https://www.facebook.com/
// @include     https://www.facebook.com/?*
// @require     http://pastebin.com/raw.php?i=2GyZd2Dy
// @version     1
// @grant       none
// ==/UserScript==

var SOUND_SRC = "https://dl.dropboxusercontent.com/u/84590655/badday.ogg";

function playSound() {
    var sound = document.getElementById("facebook_gags_badday");
    if (sound === null) {
        sound = document.createElement("audio");
        sound.src = SOUND_SRC;
        sound.id = "facebook_gags_badday";
        document.body.appendChild(sound);
    }
    sound.play();
}

addMessageHook(function(msg, currentUser) {
    if (msg.body.indexOf("*bad day*") > -1) {
        playSound();
    }
});