It's probably footage from the Angry Video Game Nerd's upcoming movie.
For those who don't know, this is a longstanding urban legend well-known in most gaming communities. I'm surprised people here don't seem to know it. I've seen it featured on History Channel special ("Rise of the Videogame" ) for crying out loud.
Back in the early days of gaming, the early 80s (I am actually old enough to remember the 80s, though I only got old enough to play the family Atari 2600 after 1985 or so...)... back in "the day" gaming was on the rise as a hobby, Atari was king, and the film E.T. was hot to trot. Atari was licensed to make a game for the film, but wanted to get it done in a quick timeframe (Christmas rush?) - they rushed it, gave the guy meant to program it all of a week to do it, all while setting up for the production of more games than currently existing consoles on the gamble that people who hadn't "played Atari today" would shell out for consoles.
Unfortunately, the poor marketing strategy combined with a rush on the game meant that they essentially sent out a beta. The first people who bought it found that it sucked pretty hard and word got around. Atari was already having some financial difficulties (if I am remembering the legend correctly), and the bombing of E.T. just sent the company (the king of gaming at the time) right down the crapper.
Having an excess of a notoriously buggy, bomb of a game, they found the most economical thing to do with them was to cut and run, and (supposedly) unload their unsold cartridges into a landfill while they tried to find a way to save their company.
Gaming as a hobby/entertainment-source flagged in the United States for a few years before Nintendo made a gamble of selling their gaming consoles in America with a fun robot-toy. Kids responded to the games themselves, because Super Mario Bros., The Legend of Zelda et. all were excellent games and thus, the U.S. market became open again.
Meanwhile, children of the 80s spread the rumor that there were, like, a gazillion E.T. cartridges buried in a landfill somewhere.
Debate goes on as to whether it was actually the "worst game ever" - I've seen the AVGN play "Big Rig Racing" (a modern game) and that one actually looks much, much worse technic-wise, but E.T. does stand as an infamous marketing-bomb.
