"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. So get comfortable, while I warm up the neurotoxin emitters."
— GLaDOS, Portal
"Warning: Neurotoxin pressure is reaching dangerously unlethal levels."
— Announcer, Portal 2
It's your old friend, deadly neurotoxin. If I were you, I'd take a deep breath. And hold it.
— GLaDOS, Portal 2