In Back to the Future Part II, there’s a point when Michael J. Fox’s character Marty McFly travels to October 21st, 2015. While that was way off in the future when the movie was initially released in 1989, it’s here now, and being celebrated by movie dorks all over the world. One of the most iconic scenes from the first film is when McFly shreds on the guitar in 1955. Playing “Johnny B. Good,” he allegedly invents rock and roll when Chuck Berry’s cousin Marvin hears his performance and calls him. It totally takes on a new meaning when what he’s playing is Kataklysm, in this viral video that’s been floating around the internet since 2007.