KONAMI-Command is a project mainly written in JavaScript, it's free.
KONAMI Command plugin for jQuery
KONAMI Command is the plugin for jQuery to implement KONAMI Code. It makes web site more fun.
// to bind document
$.konamiCmd({
callback: function(){ /* callback here */ }
});
// to bind element
$(element).konamiCmd({
callback: function(){ /* callback here */ }
});