lol, the link says "don't click me"! What kind of warning do you need? I said previously it will lock the browser. Or is your curiosity so intense that you
must click it?
Also, you can make the whole computer run REALLY slow by creating an infinite loop that does nothing, but eventually, IE will complain and ask you if it should stop running scripts. It works, but too easy to defeat. The alert version is easier and better.