Some of my favorite quotes:
Scientist: "Hello." Freeman: "Heeeeeeyyyyyyy....what a minute, I don't know you. Don't confuse me."
Freeman: "Wait a minute. Did I see what I think I did? Yep, I sure did. Newton's formula for gravitational force. Having trouble remembering that one, guys? What is this, are we back in high school now? My department's working on quantum displacement. Just what the hell are you guys doing? Jerking around in lab coats from the looks of things! I just can't believe it. Those monkeys are having trouble learning about gravity. Whereas I can recite the quantum chromodynamic gauge invariant Lagrangian in my sleep! There is no justice... am I hearing things? TURN DOWN THE MUSIC, YOU FREAKING BASSHEADS! IT SOUNDS LIKE A STRIP CLUB IN HERE! GOD DAMN! JUST GET SOME DANCING GIRLS IN CAGES, WHY DON'T YA!?! GOOD LORD! Programmers! Who knows what they're up to!"
Freeman: "Oh, oh god! What, what do I do? ... This is a bad experiment! We are BAD people! Why did we usher forth the Green Apocalypse?!"
Scientist 1: "I'll stay here." Freeman: "You do that! God, you two are creeping me out. 'Come play with us, Gordon. Forever... and ever... and ever...'" Scientist 2: "Do you know who ate all the doughnuts?" Freeman: "The doughnu--? No! I've got more important things on my mind!"
Freeman: "You know, I'm an expert on electricity, on the atomic level, anyway, and this, to me, looks like the power's on."
Freeman: "This sounds like a job for Ambassador Pineapple."
Freeman: "What the hell is that? It looks like a prison guard tower. I don't get it. This place makes no sense. [underwater mumbling]it's unconstitutional[underwater mumbling]"