Hold down the right CTRL key, press the SCROLL LOCK key twice and scare the hell out of your Sysadmin :-p

I just watched Mark Russinovich's Technet webcasts and he demoed how to create a Blue Screen of Death on a windows PC by using the right ctrl key + scroll lock + scroll lock

This is very helpful when debugging OS issues but I thought it might cause a faint on one sysadmin or two if done without warning. EYE: Do not attempt on Production servers or face an immediate let go...

Here's the KB article describing how to gather the memory dump and the types of memory dumps you can get with this technique. Cheers!