Quotes: Deadly Gas

"Good news. I've just worked out what that thing you just incinerated did. It was a Morality Core they installed after I flooded the Enrichment Center with a deadly neurotoxin to make me stop flooding the Enrichment Center with a deadly neurotoxin."
GLaDOS, Portal

"Warning: Neurotoxin levels are reaching dangerously un-lethal levels."
Announcer, Portal 2

It's your old friend, deadly neurotoxin. If I were you, I would take a deep breath. And hold it.
GLaDOS, Portal 2