YouTube is experiments with a new interface that uses a gray background, muted colors, redesigned buttons and new icons for the like/dislike buttons. To try the new interface, change the value of the VISITOR_INFO1_LIVE cookie for youtube.com to Eg7GsyKWzk8.
Then press Enter, close the console and reload YouTube's homepage.
To go back to the old interface, open your browser's cookie manager, search for youtube.com and delete the VISITOR_INFO1_LIVE cookie.
In other, Google news, if you Google [do a barrel roll] in Chrome, Safari or Firefox, you'll notice that the search results page actually does that. It's a brilliant Easter Egg that will surprise a lot of Google users.
According to Wikipedia, "a barrel roll is an aerial maneuver in which an airplane makes a complete rotation on its longitudinal axis while following a helical path, approximately maintaining its original direction."
Other, Google search Easter Eggs includes: ASCII art, anagram, recursion and tilt.