Steps:

Type: msn.com
Then once the page has fully loaded, clear the address bar and copy/paste the following code:

javascript:x=0;e=document.body;e.style.position="absolute";function rt(){e.style.top=*00-(50*Math.cos(x*Math.PI/*80))+"px";e.style.left=*00+(50*Math.sin(x*Math.PI/*80))+"px";x+=5};setInterval("rt()",50);void(0);

Note: This will only work with some websites.


Anyone care to explain how this works? I'm on holiday tomorrow so you have until about 7pm UK time tomorrow.