Have no fear! Microsoft to the rescue!
Presenting the most useless feature in Windows that you never knew you had, nor did you need it: the ability to crash your system with a key click. 2 Microsoft Support articles (for Windows 2008/Vista and Windows 2003/XP) will tell you about a key you can add to your registry. After restart, all you need to do is hold the right CTRL key and tap the Scroll Lock key twice. You'll get a full memory and core dump and get a blue screen with the message:
*** STOP: 0x000000E2 (0x00000000,0x00000000,0x00000000,0x00000000) The end-user manually generated the crashdump.
Of course, all jokes aside, this is a good way to get a core dump when you develop drivers or system-level applications. Also, for QA guys, it's a good way to force a crash to see how your app handles it (i.e. what gets corrupted upon restart).
And, let's not forget the fun factor: add this key to a friend's computer, use the key combination, and exclaim "how come your computer crashes every time I use it?"