What's a great action movie without a fight or two? Post your favorites here.
To start, here's a great example:
They Live (1988)
Nada (Roddy Piper) discovers through a special pair of sunglasses that Los Angeles is overrun by aliens (extraterrestrial, BTW). He tries to convince Frank Armitage (Keith David) to put the glasses on, but Frank's refusal sparks a back alley brawl that is perfectly choreographed. South Park even paid homage to this scene on the episode "Cripple Fight".