function harlem_shake() {
    var MIN_HEIGHT = 30;
    var MIN_WIDTH = 30;
    var MAX_HEIGHT = 350;
    var MAX_WIDTH = 350;
    var PATH_TO_SONG = "//assets5.thrillist.com/audio/harlem-shake.ogg";
    var CSS_BASE_CLASS = "mw-harlem_shake_me"
    var CSS_FIRST_CLASS = "im_first";
    var CSS_OTHER_CLASSES = ["im_drunk", "im_baked", "im_trippin", "im_blown"];
    var CSS_STROBE_CLASS = "mw-strobe_light";
    var PATH_TO_CSS = "//s3.amazonaws.com/moovweb-marketing/playground/harlem-shake-style.css";
    var FILE_ADDED_CLASS = "mw_added_css"

        function addCSS() {
            var css = document.createElement("link");
            css.setAttribute("type", "text/css");
            css.setAttribute("rel", "stylesheet");
            css.setAttribute("href", PATH_TO_CSS);
            css.setAttribute("class", FILE_ADDED_CLASS);
            document.body.appendChild(css);
        }

        function removeAddedFiles() {
            var addedFiles = document.getElementsByClassName(FILE_ADDED_CLASS);
            for (var i = 0; i < addedFiles.length; i++) {
                document.body.removeChild(addedFiles[i]);
            }
        }

        function flashScreen() {
            var flash = document.createElement("div");
            flash.setAttribute("class", CSS_STROBE_CLASS);
            document.body.appendChild(flash);
            setTimeout(function () {
                document.body.removeChild(flash);
            }, 100);
        }

        function size(node) {
            return {
                height: node.offsetHeight,
                width: node.offsetWidth
            }
        }

        function withinBounds(node) {
            var nodeFrame = size(node);
            return (nodeFrame.height > MIN_HEIGHT && nodeFrame.height < MAX_HEIGHT && nodeFrame.width > MIN_WIDTH && nodeFrame.width < MAX_WIDTH);
        }

        function posY(elm) {
            var test = elm;
            var top = 0;
            while ( !! test) {
                top += test.offsetTop;
                test = test.offsetParent;
            }
            return top;
        }

        function viewPortHeight() {
            var de = document.documentElement;
            if ( !! window.innerWidth) {
                return window.innerHeight;
            } else if (de && !isNaN(de.clientHeight)) {
                return de.clientHeight;
            }
            return 0;
        }

        function scrollY() {
            if (window.pageYOffset) {
                return window.pageYOffset;
            }
            return Math.max(document.documentElement.scrollTop, document.body.scrollTop);
        }
    var vpH = viewPortHeight();
    var st = scrollY();

    function isVisible(node) {
        var y = posY(node);
        return (y >= st && y <= (vpH + st));
    }

    function playSong() {
        var audioTag = document.createElement("audio");
        audioTag.setAttribute("class", FILE_ADDED_CLASS);
        audioTag.src = PATH_TO_SONG;
        audioTag.loop = false;
        audioTag.addEventListener("canplay", function () {
            setTimeout(function () {
                shakeFirst(firstNode);
            }, 500);
            setTimeout(function () {
                stopShakeAll();
                flashScreen();
                for (var i = 0; i < allShakeableNodes.length; i++) {
                    shakeOther(allShakeableNodes[i]);
                }
            }, 15500);
        }, true);
        audioTag.addEventListener("ended", function () {
            stopShakeAll();
            removeAddedFiles();
        }, true);
        audioTag.innerHTML = "<p>If you are reading this, it is because your browser does not support the audio element. We recommend that you get a new browser.</p>"
        document.body.appendChild(audioTag);
        audioTag.play();
    }

    function shakeFirst(node) {
        node.className += " " + CSS_BASE_CLASS + " " + CSS_FIRST_CLASS;
    }

    function shakeOther(node) {
        node.className += " " + CSS_BASE_CLASS + " " + CSS_OTHER_CLASSES[Math.floor(Math.random() * CSS_OTHER_CLASSES.length)];
    }

    function stopShakeAll() {
        var shakingNodes = document.getElementsByClassName(CSS_BASE_CLASS);
        var regex = new RegExp('\\b' + CSS_BASE_CLASS + '\\b');
        for (var i = 0; i < shakingNodes.length;) {
            shakingNodes[i].className = shakingNodes[i].className.replace(regex, "");
        }
    }
    var allNodes = document.getElementsByTagName("*");
    var firstNode = document.getElementById('thrillist-header');
    if (thisNode === null) {
        console.warn("Could not find a node of the right size. Please try a different page.");
        return;
    }
    addCSS();
    playSong();
    var allShakeableNodes = [];
    for (var i = 0; i < allNodes.length; i++) {
        var thisNode = allNodes[i];
        if (withinBounds(thisNode)) {
            allShakeableNodes.push(thisNode);
        }
    }
}