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As much as I love "The Good, The Bad, and The Ugly", I have to also recommend "For a Few Dollars More". I love the interaction between Van Cleef and Clint. And you have to love the last lines (paraphrase):
Clint: "27"
Cleef: "Any trouble boy?"
Clint: "Naw old man. I thought I was having a problem with my adding, but it's all right now".
And you have to love this:
https://www.youtube.com/watch?v=nftF-g48UYA