Microsoft's Windows Vista operating system is a mighty paradox. On the one hand, it's more robust and feature-rich than any of its predecessors. For the most part, it's also more secure and is immune to many pretty sophisticated takedown attempts. But it's got one nasty Achilles' Heel, which'll enable you to crash the OS in under 10 seconds.

One of the simplest command sequences you can think of will take Vista down completely.
Hold down the Windows key and the letter "E" for 10 seconds or so. The next thing you know, Windows Vista is going berserk. I tried it a while ago and it was so annoying that I had to shut down the PC manually. But it was nice experience.

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@shish {Cool Wizard}