Stanton is famously laid back and clearly it works since he’s in his 80s and has no less than 4 movies or shows out this year alone. He’s been quoted as saying that he plays himself as totally as he possibly can, “his own Harry Dean Stanton act.”
Now let’s go to the legendary chest-bursting scene from 1979’s Alien (YouTube has it). The actors were, as all geeks know, not informed of what would happen, and most of the actors react with shock or alarm. Stanton? He manages to slightly raise an eyebrow. The android shows more motion.
I’m not sure what sort of rough childhood Stanton had, but what sort of man reacts to that without flinching? A BAMF, that’s who. And now you know.