Adds a Konami Code easter egg to a page. Requires jQuery.

addKonamiCode.js

var addkonamiCode = function () {
    var status = 0;

    $("body").keydown(function (e) {
        if ((e.which === 38 && (status === 0 || status === 1))
        ||  (e.which === 40 && (status === 2 || status === 3))
        ||  (e.which === 37 && (status === 4 || status === 6))
        ||  (e.which === 39 && (status === 5 || status === 7))
        ||  (e.which === 66 && status === 8)) {
            status++;
        } else if (e.which === 65 && status === 9) {
            $(body).append("<div class=nyanCat></div>");
            $(".nyanCat").fadeOut({
                complete: function () { $(this).remove(); },
                duration: 2500
            });
            
            status = 0;
        } else {
            status = 0;
        }
    });
};

gistfile1.css

.nyanCat {
    display: block;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    margin: auto;
    width: 301px;
    height: 119px;
    background: url("img/nyan.gif");
}