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5. Apple 'patents' rectangles
Apple already has the rounded rectangle patent, but in 2012 popular technology news site The Register "reported" that Apple had patented the actual rectangle shape. It came around the time that Walter Isaacson's biography of Steve Jobs was publicized amid Jobs' claims he would "go to thermonuclear war" over patents. Simply put, while untrue, the site summed it up in a single line: "Yes, Apple is asserting a patent on the rectangle." The actual patent claimed in the article relates to air-valve fobs for radiators.
6. Warner Bros. acquires The Pirate Bay
TorrentFreak said in 2009 that, amid piracy suits and counter-letters from the rogue file-sharing site, that Warner Bros. had acquired The Pirate Bay in a deal worth $13 billion. It was of course a prank pulled in good humor by the piracy-enabling site, used by millions worldwide to download the latest movies, music and television. Oh, and porn. Lots and lots of porn.
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.