See Portal Beaten in Less Than 10 Minutes
Most people would be upset about massive glitches in their game. Speedrunners, however, are not usually those people.
Exhibit A: The world's fastest Portal playthrough, clocking in at just under nine and a half minutes. Pretty impressive, especially when you consider about half of that is spent in the elevator.
What's particularly notable about this speedrun is that it took two years to complete, and that the uploader intricately documented the glitches he used to achieve his goal. I hope it was worth the effort!