The people at Cinefix say these are the best ten movie fight scenes of all time. It's a pretty good list. I don't know if these are the very best. Maybe they are. I don't really care much because a) I liked it and b) I just wanted an excuse to make a Bruce Lee GIF.
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Oldboy has been my favorite for a while. It manages to be simple yet so entertaining, and it just feels so genuine. It even has more than one bad guy fighting the good guy at the same time.