After nearly two years of working at his speedrun, a guy by the name of DemonStrate has completed Portal with a time of -- by his count -- 9:25.567. Impressive, especially if you aren't aware of some of the glitches that exist within the game and allow for such quick progression.
For the majority of this video, it's hard to keep track of what exactly he's doing. The rest is, well, waiting in elevators. Thankfully, DemonStrate says he is working on a commentary video, which is exactly what this needs. Regardless, it's a fun watch.
Also, this video confirms that you cannot play Portal without putting something in the toilet.