How fast can you beat Halo 2? In August of 2005, Cody Miller managed to take on the Flood on Legendary difficulty in 3 1/2 hours ... without dying. It's an amazing feat, so much so that the 2007 Guinness Book of World Record lists Cody's stunt.
If any Joystiq readers can get a scan of the page, let us know and we'll update. The Guinness website does not have it listed yet, unfortunately.
"I bet that about 40 of you will say, "ZOMG I TOTALLY DID THAT TWO YEARS AGO IN HALF THE TIME." But you're lying. I know it, you know it and your mom knows it good and hard. So just don't."