Does the robot in this poster look familiar? It should; it inspired George Lucas's C-P3O. Promoting Fritz Lang's 1927 film "Metropolis", the poster, sold at auction back in 2005 by the Austrian National Library, brought in an impressive $690,000. Why so spendy? The movie is considered a masterpiece and only 3 other copies of the poster are known to exist. Its art deco fabulousness doesn't hurt either!
If you're groovin' on the image but are short a million bucks, not to worry. There are plenty of reproductions out there. Here's a lovely one from All Posters for about 45 bucks.
For more information about the auction, follow this jump.