Just another way of doing it...

gistfile1.js

// "Cheat" special event using this pattern:
// http://benalman.com/news/2010/03/jquery-special-events/#pattern
// 
// Also see:
// http://benalman.com/news/2010/03/jquery-special-events/#add-and-remove-tripleclick-per-handler

(function($){
  
  $.event.special.cheat = {
    setup: function() {
      $(this).bind( 'keydown', handler );
    },
    
    teardown: function() {
      $(this).unbind( 'keydown', handler );
    },
    
    add: function( handleObj ) {
      var old_handler = handleObj.handler,
          code        = handleObj.data,
          keys        = [];
      
      if ( /[a-z]/i.test(code) ) {
        code = $.map( code.toUpperCase().split(''), function(letter){
          return letter.charCodeAt(0);
        }).join(' ');
      }
      
      handleObj.handler = function( event, which ){
        keys.push(which);
        
        if ( keys.join(' ').indexOf(code) >= 0 ) {
          keys = [];
          old_handler.apply( this, arguments );
        }
      };
    },
  };
  
  function handler( event ) {
    $(this).triggerHandler( 'cheat', [ event.which ] );
  };
  
})(jQuery);


// Konami-code-specific "cheat" implementation.
(function($){
  
  var konami = '38 38 40 40 37 39 37 39 66 65';
  
  $.event.special.konami = {
    setup: function () {
      $(this).bind( 'cheat', konami, handler );
    },
    
    teardown: function () {
      $(this).unbind( 'cheat', handler );
    }
  };
  
  function handler( event ) {
    $(this).triggerHandler( 'konami', event.which );
  };
  
})(jQuery);


// Usage examples.
$('body').bind( 'cheat', 'foo', function(e){
  console.log( e.type, this, 'foo!' );
});

$('body').bind( 'konami', function(e){
  console.log( e.type, this, 'konami!' );
});