It’s just recently discovered that if you hold the “left” arrow key while any video on YouTube.com is loading or has already loaded, you will be able to play the game of Snake.
You navigate your snake around the video screen and eat up pellets, increasing the length of your snake as you go. If you hit the edges of the video or the tail of your snake, it’s Game Over.
Try it for yourself on the video of my pug, Piper I just took tonight. Just hit “Play” and then “Pause”, hit the “Left” arrow key and have fun!