Portal Challenge 14 done in three seconds. The video is played in slow motion to give you a chance to see how it's being done, and even with that you might have to watch a couple times.

On that subject, someone has recreated the Mirror's Edge E3 demo in Portal.

Despite how goofy it is, you might not want to watch this if you're the sensitive sort. This is a scene from the PC title Harvester in which -- hell, I've never played Harvester, I have no idea what's going on here. You can read a little more about it and see more videos here.

A short film about Team Fortress 2's red team coping with the loss of their jobs.

Possibly only interesting to me, but I'd always wondered what the 64DD SimCity title looked like.

In case you don't feel like doing them all yourself, GameVideos has posted a montage of all the critical finishes from Soul Calibur IV.

Everyone complained that this year's E3 sucked. I guess this is more what they were looking for? This is footage from Nintendo's 1995 E3 booth, promoting Killer Instinct via choreographed dancing from what appear to be the Bellarians from Space Mutiny, set to that cheesy Way U Move song from the Killer Cuts CD.

Edit: Once again I've managed to get embed code that doesn't work properly; just watch it here instead.