10 Fan Theories That Make Your Favourite Video Games Super Depressing

10. The Companion Cubes In Portal Contain People

A recurring joke throughout Portal is GLaDOS hinting that your faithful Companion Cube might actually be alive, warning you to ignore it if it starts talking to you, and mocking you by suggesting it was trying to say "I love you" when you destroyed it.

One theory thinks there might actually be some truth to this...

See, GLaDOS has run her tests on numerous subjects before Chell and yet we never see any bodies. This theory posits that GLaDOS incorporated them into the tests, placing them into the cubes so that they would be disposed of in the incinerator by the unwitting next subject.

The horrifying implication is that they might not necessarily be dead. If a subject breaks their leg and is unable to continue, GLaDOS would still dispose of them. The real reason she warns you not to pay attention to any voices coming from the cube, is because she doesn't want you catching on that there's a person trapped inside.

A person who you kill.

This theory even has some official support in the Portal 2 Lab Rat comic, whose main character believes he hears voices coming from the cubes. It's revealed to all be in his head, but could still be hinting towards the truth.