The Dark Knight Joker poster revealed

It's weird to think that 2007 will probably be best remembered for a marketing campaign, but The Dark Knight's has been so ace we're not sure we mind.

Remember the days when a poster would simply be placed onto a few bus shelters? If you'd have told us that, eventually, marketing bods would be sending film fans out onto the streets of America to search for a phone number hidden in a cake, which they must call in order for a poster to be released on the internet, we'd have sent you straight to Arkham.

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