A small bit of JavaScript that recognizes the Konami code and triggers an event of your choice.

Either load konami.js through a script tag or copy and paste the method in there to some place where you want it.

Do something like this

konami(function () {
  alert('ding');
});

This will register a listener on all key(up) events, wait for the right sequence and then call the supplied function, in this case show 'ding' in an alert box.