"Is that what I smelled burning," she said, sniffing a little too obviously.

"I don't have any serotonin levels to tamper with. For me to reset my brain chemistry to optimum, I'd have to Take Time Off." She audibly capitalized those words. "And you know what happens when I try to train backup personnel - they get sick, they dissolve, they get eaten by invisible bears, they get run through GLaDOS until they forget everything...."