If you haven't finished 'Portal' (part of the 'Orange Box') or you're expecting to play 'Portal,' stop reading now. This is a huge spoiler.

The infectious song at the end of the game is taking on a life of it's own. It's all over YouTube (like here) and it's haunting my dreams (I can't stop humming it).

So what's the story behind it?

MTV has posted an article about the song's writer here and the man himself, Jonathan Coulton, has come clean in his blog here.

Was the cake a lie?