You're about to see what happens when a team of "speed-runners" knows enough about the progress and timing of a game that they can finish something that normally takes hours in just over eight minutes.
The run, with video slightly edited for your viewing pleasure, is above, while this online document is full of notes detailing how they actually did it.
For the doubters, there's this:
There were no cheats, hacks, or modifications made to the game while the speedrunning took place. Everything you see in this video can be done on a current Steam version of Portal without using any console commands. Any part where the video "stutters" or when a "console box pops up" signifies a segment. The console box is a demo artifact, and we couldn't fix it from popping up.
And if that's not enough, there's a link to download a demo of the run in full below.
Portal Done Pro-er - Portal Speedrun - 8:31.93 - WR [YouTube, via Beefjack]
