It's from the video game Portal, it's included in "The Orange Box" with Half-Life Episode 2 and Team Fortress 2. You'd have to play the game to understand. To explain shortly you're only interaction in the game is with a large computer system that's hilariously sarcastic. She promises you cake if you complete the game, but she's really trying to kill you.
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What does "the cake is a lie mean" blog
