jQuery plugin to detect Konami cheat code sequence
This is almost like code golf; this could probably be shortened.  You just need to keep track of i and when it's past the end of the array, you know all the keys were hit in the correct order.

jQuery.konami = function() {
    function KonamiCode(kFn, kCode) {
        var i = 0;

        $(document).keydown(function(e) {
            var char = typeof kCode === 'string' ? String.fromCharCode(e.which).toLowerCase() : e.which;
            i = char === kCode[i] ? i + 1 : 0;
            if (i === kCode.length) {
                kFn();
                i = 0;
            }
        });
    }
    return function(fn, code) {
        // ↑ ↑ ↓ ↓ ← → ← → B A
        kCode = code || [38, 38, 40, 40, 37, 39, 37, 39, 66, 65];
        new KonamiCode(fn, kCode);
    };
}();