Interesting topic! Had to think a bit before choosing just one. We watched "Salt" with Angelina Jolie recently, and it actually reminded me of this movie in a way .... because what you think the movie is about, isn't really what the movie is about.
This clip isn't great, but it will have to do. Jon Voight in 1974. The Odessa File.
Oh and a Mr. Ed clip for MRM. Mr. and sister Carole had this on a 45.