An userscript that un-deletes forum posts on http://powdertoy.co.uk. To run, save as file and drag into extensions folder (Chrome) or use an addon (GreaseMonkey for Firefox, TamperMonkey for Mozilla). http://puu.sh/fHN7l/58ea0cde48.png THIS is what I mean by removed!

undelete.user.js

// ==UserScript==
// @name        Powder Toy Undelete Removed Comments
// @version     1.0.1
// @description Undeletes comments that have been removed, using a weird data leak.
// @author      boxmein, Mrprocom
// @namespace   http://boxmein.net
// @run-at      document-end
// @match       http://powdertoy.co.uk/Discussions/Thread/*
// ==/UserScript==
 
var injected = function() {
 
  var url = window.location.href;
 
  setInterval(function() {
    if (window.location.href != url) {
      url = window.location.href;
      $('.Message .alert.alert-danger')
        .append('<a class="btn" style="float: right; margin-top: -5px; margin-right: -32px;">Show</a>');
    }
  }, 100);
 
  $('.Message .alert.alert-danger')
    .append('<a class="btn" style="float: right; margin-top: -5px; margin-right: -32px;">Show</a>');
 
  $(document).on('click', '.btn', function() {
    var id = $(this).closest('.Message').attr('id').split('-')[1];
    var el = $(this).parent();
 
    try {
      id = parseInt(id, 10);
    } catch (err) {
      return false;
    }
 
    // console.log('undeleting', id);
    var req = location.pathname.replace('.html', '.json') + location.search;
 
    // console.log('http request to', req);
 
    $.getJSON(req).done(function(data) {
      // console.log('received', data);
 
      $.each(data.Posts, function(i, v) {
        if (v.ID == id) {
          console.log('found!', i, v, v.Post);
          el.parent().html(v.Post);
        }
      });
    });
  });
};
 
function inject(f) {
  var d = document.createElement('script');
  d.innerHTML = '('+f.toString()+')();';
  $("body").append('<script>('+f.toString()+')();</script>');
}
 
inject(injected);