Video game documentaries (for the geeks, yo!)
I imagine most people have seen "King Of Kong"
https://www.youtube.com/watch?v=_4v15X8Px34
But some others that are worth a watch...
https://www.youtube.com/watch?v=gd2t7QrQEBQ
https://www.youtube.com/watch?v=Lo7-VjS8_B8
Also, if you can find "Tetris: Ecstasy of Order", that's worth a look. It's obv about Tetris Gods. I thought it would be lame, but I watched some of the Tetris World Championships, and it's pretty intense. The World champion Jonas Neubauer is pretty much untouchable. An amateur came pretty close in 2016 to take his crown. Here is the clip.
https://www.youtube.com/watch?v=DdfRQjb5o9k