Really sneaky Facebook "bug"

It's not really a bug, but if you go into a Facebook event page and then paste the following: -

"javascript:elms=document.getElementById('friends').getElementsByTagName('li');for(var fid in elms){if(typeof elms[fid] === 'object'){fs.click(elms[fid]);}}"

Without the first and ending double quote into the browser's address bar (i.e. not into Facebook, but the browser viewing Facebook), it should select ALL your Facebook friends and invite them to the event.

Scary ...