For me, it’s a 30fps video about someone doing a Super Mario flash game walkthrough of their own level. It was pretty meticulous, pushed the physics of the game. Lots of F.L.U.D.D. (a funky water spray bottle for plumber self-propelling) and dive tricks.
Trance - 009 Sound System Dreamscape
It’s one of the theme songs of the internet, right up there alongside Darude - Sandstorm and this.