It's been ten years this week since YouTube first launched in beta on the great wide internet, and unknowingly changed the world forever. And if you've been around the site long enough, you'll know that it's so much more than pretty white vloggers doing challenges; it's a vast, expanding hub for all kinds of creativity, where over 300 hours of video are uploaded to the site per minute.
During its meteoric growth, YouTube has birthed more than its fair share of internet sensations, from musical cats to science experiments to - yes - Rick Astley. And all of them get an honorary mention in YouTube's celebratory anniversary video, "The A-Z Of YouTube".
Set to the iconic "Alphabet Aerobics" by Blackalicious, the animatic video fires through an alphabetic list of everything YouTube, taking a couple of liberties but never failing to make you react like a teen in a Fine Bros video. Check it out:
As if that wasn't enough, YouTube have turned their celebrations into a game; you can head over to YouTube.com/10 to play the A-Z of YouTube, and test your knowledge of all their greatest memes in a fun little click-and-drag trivia game.
We got them all right; but it took a couple of tries: