"I just want her to be prepared in case some bully at school is as clever as I am."

Narrator: "But no bully ever would be."

It's from the video game Portal. You go through a test facility overseen by an AI computer and as you progress, you eventually realize that the computer killed all the humans that were supposed to be overseeing her testing.

It sounds like you work at the Aperture Science Enrichment Center.