YouTube's Hidden Minigame

I've been using YouTube now for about seven years in one form or another and yet somehow i've never encountered what is one of the coolest easter eggs on just about any website. When a video fails to buffer for long enough and if a user hits the down arrow key while the video's box is focused you can play a game of snake while you wait. This is really cool and actually a bit shocking. Included here is a video of one of my early reactions to this.