Haha, I accidentally hijacked a Bungie account once. Don't ask, lots of experimenting and "I wonder if"s
The worst, I got console Banned for three months right around when ODST came out too, so of course since it was on the same server, I was banned there too.
I miss that old account, one of the first in ODST to make it to 3 million in firefight, that took all of 9 hours, loved it!
seeing as how much publicity its getting, I believe it. If it were just the video, I would have called FAKE, cause that can easily be replicated with a hex memory editor, local HTTP/PHP/script/database hosting and calling from Microsoft's Xbox Live database to fill in all the "blanks"
here is an example of what Im talking about.