This is pretty great:
But not as great as this:
It seems obvious to you, but for the less educated of us, the Combine Interview is a spoof of Tom Cruise interviewed on Scientology: http://www.youtube.com/watch?v=UFBZ_uAbxS0
Hah! I didn't realise that, thanks for pointing it out.
The latter video reminded me of "troopers".