jQuery konami code extension

GITHUB: http://github.com/soldair/jquery-konami-code-extension
git clone: http://github.com/soldair/jquery-konami-code-extension.git

This extension is designed to be light and only bind the global konami code key sequence event to the window.
What is the konami code? http://en.wikipedia.org/wiki/Konami_code

trigger the konami code to see what happens

$(function(){
	$.konami(function(){
		var orig  = $("#example").clone()[0];
		$("#example").html("<h1>KONAMMMIIIII!!!!!!!!</h1>").css({background:'blue',color:'orange'});
		setTimeout(function(){
			$("#example").replaceWith(orig);
		},5000);
	});
});

Source:

/*
 * konami jQuery extension v0.1
 * http://ryanday.org/konami
 *
 * Copyright (c) 2009 Ryan Day
 * Dual licensed under the MIT and GPL licenses.
 *
 * http://docs.jquery.com/License
 *
 * for another great implementation checkout
 *	http://plugins.jquery.com/project/konami-code
 *
 */

//- http://en.wikipedia.org/wiki/Konami_code
(function($){
	$.extend($,{
		konami:function fn(cb){
			if(!fn.setup){
				fn.setup = true;
				fn.callbacks = [];
				var buffer = "";
				var code = "38384040373937396665";
				var konami = function(ev){

					var key = ev.keyCode || ev.which;

					if(key){
						buffer += (key+'');
						if(buffer == code){
							buffer = "";
							$.each(fn.callbacks,function(k,v){
								v.call(this,ev);
							});
						} else if(code.indexOf(buffer) !== 0){
							if(buffer.indexOf(key) == 0){
								buffer = key;
							} else {
								buffer = "";
							}
						}
					}
			
				}
			
				var lastDown;
				$(document).bind('keyup',function(ev){
					if(ev.keyCode == lastDown){
						lastDown = false;
						konami(ev);
					}
				});
				
				$(document).bind('keydown',function(ev){
					lastDown = ev.keyCode;
				});
			}
			if(cb) fn.callbacks.push(cb);
		}
	});
})(jQuery);