The classic arcade game Snake lives on through YouTube with a clever new version hidden in certain videos.
To find it, you need to go to a video in the gaming category, click inside the area of the video, and then hold down the left arrow key.
Shortly after, a trail of white dots will start scrolling across the video, with a single blinking white dot that you need to steer your snake across.
Its kinda difficult to do on a busy background, but chances are somebody will post a plain black video to make it easier.
Enjoy!