.: How to turn your computer screen upside down

Hold these three keys down together:

I already know what you are thinking -- So, yes, it is pretty deliciously evil to flip your friend's entire computer display. This rotate screen trick does not work on all computers. But if your unfortunate friend or co-worker has a decently modern laptop with Windows XP or newer, there is a pretty good chance that you can get some good panic moments out of your innocent victim. (Just be sure that the IT help desk doesn't find out that it was you ...)