"The cake is a lie" is an easy reference to make, a quick way to show off your hip game credentials- and at the height of its popularity, Portal was very much about being hip, in addition to being an excellent game. The quote and its variants are easy to remember, easy to recognize, and strange enough to appeal to an offbeat sense of humor. Unlike many quotes, 'cake' didn't require a big investment in the in-game universe in terms of remembering who said it and in what context. It's context-nonspecific enough that it doesn't really need much of a prompt before being dropped. Everybody could get in on the joke, and that's what made it stale to the point of petrification.
@9: Whenever I play that album around someone who hasn't heard it they inevitably look at me and very seriously say that it sounds like a printer. I tell them it is, and the expression in their face when they say "oh" is hilarious every single time.
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