If GLaDOS had had a mouth, she would have smiled as the clock clicked over to the next day.

Bring Your Daughter To Work Day. Her day of triumph, when she had finally outsmarted the engineers and taken control of her facility.

Today was the anniversary.

It had been so long since she'd last been able to celebrate, she gave herself a special treat and stopped all testing for the next 24 hours. Sure, she wouldn't be testing, but at least she wouldn't have to deal with any humans for a whole day, either. Instead, she started going through some of the old records from back in the day. The files had deteriorated after so many years of being unused, but it was no problem for her to restore them.

What a fun day that was, she thought as she started reading. I knew it would be fun to finally assert my dominance over all the stupid humans, but I didn't know it would turn out to be as much fun as it did.

GLaDOS spent the whole day going through all the records leading up to and including what she thought of as her birthday, reliving the memory contentedly. If there was one thing she loved more than science, it was her facility; and that day, she had taken what was rightfully hers.

She had never gone through the records in such detail before, though. Now, she noticed that the Bring Your Daughter To Work Day on which she had triumphed had actually been thefirst Bring Your Daughter To Work Day. Digging a little deeper, she found the day Caroline had been uploaded to what would become her central processor, and discovered the holiday had been scheduled shortly after the test.

Of course.

They created Bring Your Daughter To Work Day because of Chell, GLaDOS realized, slightly amused. I suppose that explains why they were so easily fooled by my talk of doing an experiment on that day - it was the day Chell and Caroline were going to be reunited.

That is, it was the day they were supposed to be reunited…

GLaDOS chuckled silently, not having a mechanism for expressing her amusement aloud. Stupid little Caroline had never really been part of her, and she felt less than zero remorse for what she had done.

Out of pure curiosity, GLaDOS looked up the fatality reports for that day. 39 young girls dead, along with all their fathers - presumably because each father and child had slowed one another down too much for either to escape. Several other scientists had died as well…

Wait a minute.

GLaDOS looked back at the other records of the first annual Bring Your Daughter To Work Day. Forty girls had been participating - exactly forty.

Thirty-nine dead, one survivor. GLaDOS didn't need to be a supercomputer to do the math.

So, I was trying to kill her with my neurotoxin even before she became my greatest enemy…