For Science.

(. . . )You Monster."

I know that it's not a perfect rendition of GLaDOS I put there, but I tried imagining what Chell's expression would be like during the scene where GLaDOS picks her up and flings her around the devastated chamber. Even though Chell is a mute, I'd imagine that she's not an emotionless doll.

So here's Chell, terrified. And there's GLaDOS, calling her a monster.