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7. CatBlock blocks ads with cats
Millions use AdBlock around the world to block annoying Flash and image-based advertisements on websites. For April Fools' Day, the creators of the popular Chrome and Safari plugin replaced ads with pictures of cats -- transforming some of the most popular sites on the Web with kitty-based imagery. But the prank was such so successful that it was spun out as a separate project and made available to the public.
8. Hulu jumps back to '1996' era
Hulu has alwas kept ahead of the technological curve, except for April Fools' Day 2011 when the site reverted back to how it might have looked in pre-Web 2.0 days. With older fonts, such as Times New Roman, and poor graphics and animated GIFs, along with two buttons at the bottom for Netscape and Internet Explorer, the video streaming network pulled off a prank that likely made many to think back to the warm and comforting days of CompuServe and AOL.
9. FCC 'may fine' then-Yahoo CEO Carol Bartz over swearing
Yahoo's former chief executive Carol Bartz was famed above many thing for swearing following a mini tirade at former TechCrunch editor Michael Arrington. To get in on the joke and turn what could've been a bit of a tricky public relations problem into something funny for April Fools' Day in 2010, the Web giant published a piece on claims the Federal Communication Commission's (FCC) was "looking into" her swearing after she allegedly swore incessantly on television. But, as with many of these jokes, it never actually happened.