30 years ago, Michael Keaton ruined a huge Batman plot twist on a chat show the day before the film was released in cinemas.
The actor, who played Bruce Wayne in the Tim Burton film, was being interviewed by David Letterman when he let the spoiler slip.
Letterman asked Keaton what the Joker – played by Jack Nicholson – had done to anger his character in the film to which Keaton revealed a little too much.
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