Blow-Up is a 1960's movie about a photographer who believes he may have witnessed a murder and unknowlingly taken photographs of the killing. It's the first English-language film from Italian director Michelangelo Antonioni and in my opinion, is a definite classic. I can't exactly tell you why, but I really dig the poster for it. It's got a cool energy and would look great professionally framed and hung in a home.
Here's the trailer for the movie and if you're interested in getting the poster, it's available at AllPosters.com, though an original secured from eBay would look best.