The five best online April Fools' pranks

4. YouTube goes upside-down

Oh, those crazy kids over at YouTube. In 2009, visitors to the YouTube homepage were startled to find that much of the featured content had been flipped upside-down. And not just the video feed, either: The text was upside-down, too, which was enough to make the most-iron stomached Web user a little dizzy. Thankfully, by the next day, things were back to normal.

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