Rififi's a great French film noir and one of the best heist movies I've ever seen. The heist sequence, which happens around the middle of the film, is like thirty minutes long and done without a soundtrack and no speaking, nothing except natural sound, and it's absolutely riveting. Great performances all around and a pretty awesome bleak ending.
Walker isn't a western, I dunno why people here are categorizing it as such, it's a biopic of some wacky Amurrrican who went to South America and did a lot of crazy shit. The movie is really a mess, deliberately anachronistic in parts (there's a scene where Walker is reading an issue of Time magazine from the 1980s, as I recall), and one of Alex Cox's worst (his best being Three Businessmen, Revengers Tragedy which I think TVC STILL hasn't seen, Sid & Nancy and Repo Man). Not as bad as Straight to Hell, but only worth watching for the Harris performance.