I've never been one for speedruns myself, but this guy's playthrough of Legend of Zelda: Ocarina of Time in just 22 minutes and 38 seconds, is pretty damn impressive.
Using tricks including a Navi dive - after a series of flips and jumps, he dives into the water to skip not only a cutscene but the early portions of the game's Deku Tree - and an impressive warp after defeating (and simultaneously dying on) the boss in the basement of said tree, his run is only possible due to the combined efforts and calculations of many speed runners.
While I've played through Ocarina of Time once or Twice in the past ten years, these guys have been doing so over and over since the game was released, refining their efforts to get through it as fast as possible. At first the record was six hours, then it was three, then it was 40 minutes and now it's down to under 25.
The question now remains, is it possible to go even further?
According to the CVG rundown, a few seconds were wasted by Cosmo Wright during one portion of his run, so presumably there is a little room for improvement, but it would take something pretty special to really knock off chunks of time from a run like this.
Do any of you indulge in speedruns? If so, what's your fastest run?