During the Great Depression, the Tennessee Valley Authority outlawed pet rabbits, forcing many to hot glue-gun long ears onto their pet mice.

GLaDOS: Oh, thank God you're all right. You know, being Caroline taught me a valuable lesson. I thought you were my greatest enemy, when all along you were my best friend. The surge of emotion that shot through me when I saved your life taught me an even more valuable lesson - where Caroline lives in my brain.

beep

Announcer: Caroline deleted.

GLaDOS: Goodbye, Caroline. You know, deleting Caroline just now taught me a valuable lesson: the best solution to a problem is usually the easiest one. And I'll be honest. Killing you? Is hard. You know what my days used to be like? I just tested. Nobody murdered me. Or put me in a potato. Or fed me to birds. I had a pretty good life. And then you showed up. You dangerous, mute lunatic. So you know what? You win. Just go.

GLaDOS starts Chell's elevator moving up; she laughs softly

GLaDOS: It's been fun. Don't come back.

All these science spheres are made of asbestos by the way, keeps out the rats. Let us know if you feel a shortness of breathe, a persistent dry cough or your heart stopping, because that's not part of the test. That's asbestos.

Most people emerge from suspension terribly undernourished. I want to congratulate you on beating the odds and somehow managing to pack on a few pounds.

The two of you have formed an excellent partnership, with one of you handling the cerebral challenges and the other ready to ponderously waddle into action should the test suddenly become an eating contest.