Ever wonder who was on the other end of that red phone in GLaDOS's AI chamber? Well now you know.
"Aperture IT support, how can I help you? What do you mean GLaDOS is sentient!?!? She wasn't supposed to be turned on!! Who authorized her to be turned on?!? Oh god, what's that smell? Oh no it's the smell of..."
DEADLY NEUROTOXIN *CLICK*