Why is there no "originalScrop" property of the event Object? This would be very useful

gistfile1.js

{
  show: function(){
    $(document).on('keydown',this.keydownListener);
  },
  keydownListener: function(e){
    if(e.which===27){ e.originalScope.hide(); } /// <----- originalScope
  },
  hide: function(){
    $(document).off('keydown',this.keydownListener);
  }
}