Twitch Plays Pokémon (partially found footage of Let's Play channel; 2014)
From The Lost Media Wiki
Twitch Plays Pokémon is an ongoing "social experiment" that is run by an anonymous Australian programmer on Twitch.tv. The stream has spawned a cult-like following since its beginning on February 12th, 2014 with the highest viewership count being 120,000 at once and reaching a total of over 30 million.
Despite its popularity, the first day and a half of the stream was not recorded by anyone. The recording of the stream did not start until Day 1, 11 Hours into the game, leaving the capture of important early characters lost. Since Twitch deleted most archived streams, it's likely that this section of the stream will never be found.