I've never seen Robert Altman's version of Raymond Chandler's The Long Goodbye, but now I'm intrigued. Apparently the movie initially opened to poor reviews and sales, and United Artists concluded that the problem was Richard Amsel's poster (above). They spent $40,000 on a new campaign designed by Mad magazine artist Jack Davis:
You can read more about the campaign and see more posters here, and buy the posters at eBay.
Here's the trailer:
And it looks like the entire film is at Youtube.