theync.user.js

// ==UserScript==
// @name yncUndeground
// @description userjs for downloading theync undeground video
// @author anon
// @license no
// @version 1.0
// @include http://theync.com/*
// ==/UserScript==

(function(window, undefined) {
    var w;
    if (unsafeWindow != "undefined") {
        w = unsafeWindow;
    } else {
        w = window;
    }

    if (w.self != w.top) {
        return;
    }

    var refs = document.getElementsByClassName('yncHPThumbLink');

    for (var i = 0; i < refs.length; i++) {
        var img = refs[i].style['backgroundImage'];
        var vid = (img.match(/pageTN([0-9]+)/))[1];

        var ref = refs[i].href;
        var file = (ref.match(/.+\/([^\.]+)/))[1];

        refs[i].href = 'http://media.theync.com/vids/video' + vid + '.mp4';
        refs[i].download = file + '.mp4';
    }

})(window);