Awesome: Robot Unicorn Attack: Heavy Metal Edition
Every single moment spent playing this game is completely and utterly awesome.
At the end of February 2010 when /v/ found this game they loved it so much that they convinced moot to change the background to a rainbow-colored one and loop the Crowning Music of Awesome for a day. Unfortunately, everything went back to normal the next day.
And then it came back during E3 week to quell /v/ in response to some of the shitstorms that ensued after some of the conferences.