Barton Fink (Joel Coen, 1991, USA)
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Average viewer rating: 7.5/10
My rating: 7/10
Less comical than the other Coen Brothers films in my opinion, and far darker; centered around a New York writer (John Turturro) who tries his hand at writing a screenplay for a big-budget Hollywood movie. As the stress builds, increasingly gruesome and surreal events take place in his life, ending with quite an ambiguous climax. There are plenty of different "hidden messages" in the film, most notably the way that Hollywood is portrayed as an analogy for Hell.
Viewed on DVD which I bought for £1.99. Bargain.

Shallow Grave (Danny Boyle, 1994, UK)
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Average user rating: 7.4/10
My rating: 9/10
Very dark, but the perfect thriller. Set in Edinburgh and concerning three flatmates (Christopher Eccleston, Ewan McGregor and Kerry Fox), whose new lodger is found dead in his bedroom with a huge suitcase full of money under his bed. They decide to keep the money and dispose of the corpse, obviously with some rather sinister consequences. Perfect acting, perfect atmosphere, perfect cinematography, perfect plot twists...
Bought on DVD after I saw it on TV many moons ago and was massively impressed.