I'm sort of surprised that there's not already a topic about it, and if there is then I couldn't find it.
Anyway, this is a video of someone beating portal in a bit under nine and a half minutes, with some terrible singing at the end.
Now this uses glitches etc. to get the best time, so through quite a lot of the video I had no idea what was going on.
Luckily he has videos with commentary, in which he explains everything he does, and then does it to show you how it works,
I found those more interesting to watch than the actual speedrun, and you can find a playlist of the commentary videos behind this link.
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