It's not often a company becomes its own worst enemy, but Aperture Laboratories found a way. Run by a man with a goal to sell curtains to the military, Aperture strived to develop more interesting ideas. And by "interesting" I mean "super, super evil." It made anti-anti choking devices, tricking homeless people into being experimented on, and went around stealing wishes from dying children, all in the name of science.
Given infinite resources by the government thanks to its burgeoning portal technology, the company would end up using its newfound funding toward its unwitting dark descent into science madness. Along came GLaDOS, an artificial intelligence meant to help with administrative tasks. Upon being "born," she swiftly murdered the entire staff with neurotoxin. Then, in a turn of events that weren't even remotely surprising, she went on her merry way conducting deadly research on people Aperture had contained specifically for the gruesome purpose. Not cool, GLaDOS, and no gold star for Aperture, either.