Trading Places -- "A snobbish investor and a wily street con artist find their positions reversed as part of a bet by two callous millionaires" -- Dan Aykroyd and Eddie Murphy in a classic movie (plus Jamie Lee Curtis as a hooker with a heart of gold).
Stanley Kubrick's The Shining. Shelley Duvall does an outstanding performance. The set, dialogue, small cast, brilliant director and writer makes The Shining a film that cannot be remade. One of the scariest movies I've ever seen