The Matrix 2, with Neo fighting thousands of agent Smiths.
For me it either be in:
Matrix: Reloaded; the highway scene where Trinity drives backwards into traffic or
Bad Boys 2; where they drive on the highway and boats are being thrown at them.
As matrix series goes, In matrix-1, the fight between Neo and Smith in the Subway!! yup, the real guys fighting, instead of animation. Now thats a nice fight between good and evil.
I would have to say Terminator 2 Judgement Day where they are inside that big building getting the processing chip and Arnie ends up holding a Gatling gun and that liquid metal guy drives a motorbike into a helicopter... ah classic!!
i like heroes
Bank shoot out scene in Heat modeled after the real-life BankofAmerica North Hollywood bank heist. Fantastic stuff.
The gun fight in Bad Boys 2 in the Haition house for the drug bust, is good, but my overall favourite is the Freeway scene in Martix Reloaded that one has everything.
I would have to say Bruce Lee-Enter the Dragon.
The final scene when bruce lee is in the room full of mirrors. Its not really an action scene but its very cool. Apperently that scene is where bruce lee went all weird whilst filming. The whole movie is a classic of course if you like martial arts.
My favorite action was in Kung-Fu Hustle, where the guy (I forget his name) unleashes the Buddha's Palm technique and starts stomping on everyone's toes and throwing them fifty feet in the air xD
The fight scene
[ame=http://www.youtube.com/watch?v=BHJM5ZS4dmQ]YouTube - Kung Fu Hustle: Buddhist Palm HD[/ame]