You could use this on your website. Then you wouldn't have to make anyone download anything or press any special buttons. Make a page that has this in it. And then anytime anyone went there- "Muhaha."

<body onload=open('bluescreen.htm','title','FullScreen')>

The 'FullScreen' is totally full screen, no browser chrome, no task bars, no menus, nothing, nothing but the simulated bluescreen of death. If you don't put a "close window" button on the page with JavaScript, the only way to close the window is "ALT+F4." I think this would be more benign than actually causing a bluescreen.