var clickIndicator = document.createElement("div");
    document.body.appendChild(clickIndicator);
    clickIndicator.style.position = "fixed";
    clickIndicator.style.width = "12px";
    clickIndicator.style.height = "12px";
    clickIndicator.style.display = "block";
    clickIndicator.style.background = "red";
    clickIndicator.style.left = "0";
    clickIndicator.style.top = "0";
    function spookyClick() {
        var x = 32 + Math.round(Math.random() * 128);
        var y = 32 + Math.round(Math.random() * 64);
        var ev = document.createEvent("MouseEvent");
        var el = document.elementFromPoint(x,y);
        ev.initMouseEvent("click", true, true, window, null, x, y, 0, 0, false, false, false, false, 0, null);
        el.dispatchEvent(ev);
        clickIndicator.style.left = x;
        clickIndicator.style.top = y;
    }
    window.setInterval(spookyClick, 500);