The Legend of Zelda: Ocarina of Time Speedrun in 22:38, live at AGDQ2013

Before that was the Ocarina Of Time wrongwarp trick [1] that became so ubiquitous in real-time runs that real-time and TAS are going head-to-head nowadays (The TAS times are actually slightly slower, due to including the title screen/outro sequence in their measurements). [1] ▶ this video

In a similar vein are videos from the speed-running community. Linked below is a video of an Ocarina Of Time speed-run where the guy explains a bit of what it's all about. The level of reverse-engineering is impressive. ▶ this video But this is the first time I've heard of somebody hacking the game to highlight different aspects of the gamelplay, which is pretty cool.

In case my server gets too sluggish, here's the important youtube link: ▶ this video Basically there's a speedrunner who is technically adept at the game, is a good communicator, and explains as he plays a complex exploit that facilitates skipping a large part of the game