All from Portal:

"Remember, the Aperture Science ‘Bring Your Daughter to Work Day’ is the perfect time to have her tested."

"Although the euthanizing process is remarkably painful, 8 out of 10 Aperture Science engineers believe that the companion cube is most likely incapable of feeling much pain."

"That thing you burned up isn't important to me. It's the fluid catalytic cracking unit. It made shoes for orphans. Nice job breaking it, hero."

Man, how can I be the first one to pull a Portal quote?