How does Sarah know which button, of the three, to press on the machine that ends up killing the T-800 at the end of The Terminator?
She had never seen that type of machine before, prior to her climbing into it, across, and to the other side. She then pulls the bars down and without looking at one of the three buttons, she reaches over with her left hand and manages to press the top red button. The machine ends up dropping and smashing the T-800's top body.