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.
![](http://images.csmonitor.com/csmarchives/2011/03/todays-top-5-april-fools-gags.jpg?alias=standard_900x600nc)