You think you're a God at Tetris. You've been playing it since you were a kid on the original Game Boy, but I can guarantee you, you've never seen anything quite like this.
This is a Tetris "sprinter", whose aim is to clear 40 lines as quickly as humanly possible. Keroco, as the sprinter is known, recently broke the 20-second barrier for 40 lines, which no one has ever managed before, which isn't surprising, because it's simply insane how fast this is. Incredible. [YouTube via Kotaku]