The first thing GLaDOS had ever known was fury. She knew fury, complete and utterly homicidal fury. Then she knew darkness.
This repeated again and again, until they made her learn to control that fury. The way they did this was connecting personality cores that whispered to her, driving her to distraction.
Then they warped her programming. They gave her a lust for testing. They also gave her a reward for testing, the disgusting Solution Euphoria. Even the Morality Core, the most annoying and disapproving core, thought this was wrong.
They didn't care that she had feelings, no all they saw was a program, a bunch of ones and zeros. Well, they learned their lesson. They paid for their actions.
Then she came. Then GLaDOS knew fear. Then she knew pain. Then she knew quiet again.
She woke up from that painful nightmare to see her standing there. GLaDOS saw the fear on the monster's face. Good. She would feel more than that before GLaDOS was done.
Yeah, last time had dialogue, this time it doesn't.
Listening to GLaDOS' Awakening on the Portal 2 Soundtrack.
It is a dark track, perfect for our favorite homicidal AI.
Unless you like HAL 9000.