Microsoft thinks you don't see BSOD often enough!
ROFL! It's a screensaver (ironically) available on Microsoft's website that is locked in a perpetual rebooting cycle, displaying a new Blue Screen of Death message every time. Need I say, office prank?
And to quote some guy I know,
I installed the screensaver, went out for lunch and came back to find my computer rebooting. I yelled at my colleagues because of them rebooting the bloody thing. I said "it was only a screensaver you bunch of idiots!" All the time they stared at me in just the way a cow looks when chewing a small pluck of grass. It was then that I realised the windows booting screen was also the screensaver. That's self ownage if there ever was any. :$