YouTube is going all out for April Fools' Day today, revealing which outlandish trends will go viral for the remainder of the year—based on the premise that YouTube itself masterminds the site's biggest viral videos, trends and memes, like Gangnam Style, the Harlem Shake and Rebecca Black's "Friday." "Here at YouTube HQ, we write, shoot, and upload all of the world's most popular viral videos. Here's a sneak peek at what you'll be watching in 2014," the site says. The trends include: • Clocking: The new planking! Hold your arms in the shape of the time in a public place.