Be warned, you will loose all will to do anything else ...
temaris had this link in her journal http://www.albinoblacksheep.com/flash/squares2.php, and you have to go play. You'll never leave the page and you will have the inescapable desire to share the link, but I just had to post it. Just remember, when you loko up and find four hours have passed it's all temaris' fault!