*After you Choose not to go with Gman at the end of HL1*
Gordon: Shit, isn't this the ending of the First episode of Doom 1?
Anyone who doesn't get this FAILS.
The GCFs are encrypted with a 128bit-32Char Alphanumeric Combination, it is very unlikely someone could crack it before it is released unless they had a super computer or something.
EP1:
Alyx: Is Dr. Kleiner really telling us to get busy?
Me: Yeah b*tch, lets get it on!
EP2 Trailer:
Alyx: Gordon, help!
Gordon: *snicker* *runs away*
HL2:
BME Half way threw Judith's "speech"
Gordon: SHUT UP YOUR MOUTH.