These kids (and adults!) have invested what looks like a ridiculous amount of time and energy creating a documentary on Portal's Aperture Science. Not a short five-minute web clip. Like, a 21-minute documentary.
Don't worry, it's not serious. It's not a Valve neckbeard convention agonising over easter eggs and links to Half-Life 2. It's just a bunch of people, some mildly funny, some genuinely funny, talking about their jobs at the world's worst/best tech company.
Also, he may not have the face, but that Cave Johnson certainly gets the spirit of the man right.