Twitter.com Frame Escaping Code

<script>
function bust () {
  document.write = "";
  window.top.location = window.self.location;
  setTimeout(function() {
    document.body.innerHTML = '';
    }, 0);
  window.self.onload = function(evt) {
    document.body.innerHTML = '';
  };
}
if (window.top !== window.self) { // are you trying to put self in an iframe?
  try {
    if (window.top.location.host) { // this is illegal to access unless you share a non-spoofable document domain
      // fun times
    } else {
      bust(); // chrome executes this
    }
  } catch (ex) {
    bust(); // everyone executes this
  }
}
</script>