“When I get home, I need to get those damn frog coins!!”
+1 Internet to the one who get the reference.
He doesn’t think.
He’s a robot from the future.
H.E.C.U. grunt 1: so who is this guy freeman?
gordon: you don’t know me? I killed 1000000 of your millitary friends and you keep without knowing me?
H.E.C.U. grunt 2: I dunno he was with the scientist team.
Gordon: oh come on man how can you don’t know me?
H.E.C.U. grunt 1: blah blah blah sabotage
gordon: do you really think I want to make sabotage on that? You idiot I earn more money if it works!
H.E.C.U. grunt 2: blah blah blah I only know he has killed my friends.
Gordon: didn’t you do the same with mines? Oh wait ya know me a more little bit!
H.E.C.U. grunt 1: oh yes he will pay…
Gordon: enough!
Then you kill them with an MP5 Grenade and everybody is happy. 
lol
Gordon: Damn, I can really go for some cheese right now.
i think he’s usually like “god fucking dammit where the hell is this shit coming from and why the hell does alyx have red hair”
Eli: Alyx, why don’t you show Gordon the Gravity gun.
Alyx: Cmon, Gordon. Let’s have some fun.
Gordon: I’ll have fun with you any day
Okay, so maybe that was a little dirty…
“Why am I being controlled by some fat geek who claims I’m supposed to be him as me being played by him and that’s why I can’t see my own reflection on the water because I’m supposed to represent the player even though I look nothing like the player because my very well defined face is plastered all over the cover and promotional material yet still Valve claims that I represent the player and that my actions are supposed to be that of the player that is controlling me through means of a controller device which I suppose works by means of advanced telepathy or something like that maybe it transmits special waves that stimulates certain parts of the brain compelling me to perform actions even though I did not really wanted to make them because all I wanted to do was to chill out on my sofa and watch reruns of Baywatch while drinking some cold ones.”
“I hope no one noticed I spilled my iced tea all over this big blinking panel of lights. Eh, it’s probably just decorative anyway.”
Later:
“Uuuuh… Oops.”
(After driving through the window on the coast)
WHAA HA HA! I’ve always wanted to do that! I can’t believe I just did that! HA HA!
“WHY IS EVERYTHING TRYING TO KILL ME?!”
“there is no distanccce between usssss…”
John freeman, over here.
I bet I could pee in this thing…
“I wonder how Barney is going to react when I tell him I don’t drink beer…”
“How would he react if I started humming the Barney theme song…”
“Why do YOU have to wear ridiculous ties. I’m going to go change into something more badass.”
I need sleep. I haven’t slept for like, twenty years. I mean, even if you consider being in whatever stasis I’ve been in sleep, I have been awake for at least five days straight. I guess staying awake for days at a time is one thing I learned how to do at MIT, I mean, aside from all the science. God that school was hard. But I think what I’m doing now may be harder. This car is NOT easy to drive, and there are a lot of big aliens who want to kill me right now, and they’re getting pretty close to that rocket launch site. At least that Alyx girl seems to like me, and I think she’s part Asian. That’s the only reason I went to MIT in the first place: I likes me some Asian women.
well some1 got my joke.
Rebel: hey everybody let’s follow freeman!
Gordon: how do you know I want YOU following me? I didn’t ever did a word!.. wait ya have telephatic powars! come on open that door without touching it and kill the metropolice behind it without need to shoot or attack him just use his bullets against him!!!
the Rebel mind: why is freeman looking me so much with that smile?
Grr.
I’ll usually just murmur something foul at my enemies in the heat of battles. 
I get angry with video games sometimes.